With puff pastry spinach swirls, everything comes down to one step that sounds harmless: 5 minutes at 100°C on speed 1. We are not just heating the thawed spinach there, we are deliberately reducing the liquid. Anyone who leaves the mixing bowl lid open without the measuring cup gets a firm spinach and cheese mixture after those 5 minutes. Anyone who closes it ends up with a soup, and that soup will later soak into the puff pastry from below, so the swirls flatten out in the oven instead of puffing up.
We have been baking these swirls for years whenever something warm needs to be on the table quickly and three different tastes need to be satisfied at once. They work as a warm main course with salad, the next day cold from a lunchbox, and they survive the journey to a picnic without going soggy. The secret is not some clever recipe, but the order of steps in the mixing bowl and a ready-made puff pastry from the chiller aisle, which we use here without any guilt.
With 500 g frozen spinach, 200 g goat’s cheese, 2 garlic cloves, 1 onion and 550 g puff pastry from the chiller aisle, six servings are on the table in 35 minutes. Prep takes 15 minutes, baking 15 minutes, with a few minutes of oven heating in between. One serving comes in at around 647 kcal with 16 g protein. Not a diet snack, but an honest figure for a full dish made from puff pastry and cheese.
Puff Pastry Spinach Swirls with the Thermomix®
Ingredients 0 / 10 ✓
- 200 g goat's cheese
- 2 garlic cloves
- 1 onion
- 10 g olive oil
- 500 g leaf spinach frozen, thawed
- 1/2 tsp salt
- 1/4 tsp pepper
- 1 pinch nutmeg
- 550 g puff pastry frozen, thawed
- 1 egg
Instructions 0 / 8
-
1
Break the cheese into pieces, add to the mixing bowl and chop for 5 sec / speed 5, then set aside.
-
2
Peel the garlic and onion. Add the garlic to the mixing bowl and chop for 3 sec / speed 8. Halve the onion, add and chop for 3 sec / speed 5, then push down with the spatula.
-
3
Add the oil and sweat for 3 min / Varoma / speed 1.
-
4
Add the spinach, salt, pepper and nutmeg and heat for 5 min / 100°C / speed 1.
-
5
Meanwhile, preheat the oven to 200°C fan and line the baking tray with baking paper.
-
6
Roll out the puff pastry pieces, spread the spinach mixture evenly over the surface and then sprinkle with the cheese.
-
7
Roll up the puff pastry, cut into finger-width slices with a sharp knife and arrange on the tray with a little space between each.
-
8
Whisk the egg in a cup, brush over the swirls and bake for 10 to 15 minutes on the middle shelf.
Nutrition per serving
Why the order in the mixing bowl matters
We always start with the goat’s cheese. 5 seconds at speed 5 is enough to break the 200 g down into coarse crumbs that will stick evenly to the spinach layer when scattered on top. The cheese then goes into a small bowl and waits there until the filling is ready. Adding it later means extra work, because the spinach water causes it to clump and the mixing bowl needs cleaning between each step.
Next come the garlic and onion. The garlic goes in first, 3 seconds at speed 8. The onion follows, halved, also for 3 seconds but at speed 5. The two speeds differ for a specific reason: garlic needs high speed, otherwise whole cloves cling to the blade. Onion at speed 8 turns to a puree and releases too much juice into the pan. Speed 5 keeps the onion at a chopped texture. Push everything down once with the spatula, then add the 10 g olive oil and sweat for 3 min / Varoma / speed 1. That is the point at which the kitchen starts to smell good.
The 5 minutes that turn a soup into a filling
The thawed spinach now goes into the mixing bowl with 1/2 tsp salt, 1/4 tsp pepper and a pinch of nutmeg. Then the important instruction: 5 min / 100°C / speed 1, without the measuring cup. Place the simmering basket at an angle over the opening instead, so nothing splashes out but steam can escape. Frozen spinach is roughly 90 per cent water. If that water stays in the mixing bowl, it will run out when the mixture is spread on the puff pastry and dissolve the delicate layers from below.
After 5 minutes the mixture is visibly darker and the texture is thick but not liquid. When we press the spatula in, no water runs back into the groove. That is the point at which the filling stops being a risk to the pastry. Anyone in a hurry who cuts the time to 3 minutes ends up with a puddle. Anyone who extends it to 8 minutes gets tough spinach. The 5 minutes are not a random figure, they settled as the point at which the water is gone and the flavour remains, after several attempts.
Rolling, cutting and glazing the puff pastry correctly
While the spinach reduces, preheat the oven to 200°C fan. This is not an arbitrary temperature, it is the lower threshold at which puff pastry rises properly. At 180°C the layers stay flat; at 220°C the surface browns too quickly and the inside stays doughy. Fan heat also ensures the swirls crisp up evenly all round, which top and bottom heat only manages on the upper half.
Work with the puff pastry straight from the fridge. It is then firm enough to roll but still pliable. Spread the spinach mixture evenly and thinly, leaving a border of one to two centimetres all the way round. Then scatter the cheese crumbs over the top. The order matters: anyone who scatters the cheese first and then puts the spinach on top pushes the crumbs out of the pastry during rolling. Roll up, then cut into finger-width slices with a sharp knife. A blunt knife compresses the pastry and seals the layers that are supposed to open up in the oven.
Place the slices on the baking tray with space between each. The pastry rises by about a third in the oven, and swirls that touch each other stick together into a slab. Whisk one egg in a cup with a fork and dab it onto the top of each swirl with a pastry brush rather than stroking. Dabbing distributes the egg yolk evenly without crushing the spiral. 10 to 15 minutes on the middle shelf, until the surface is golden and glossy.
What can go wrong and why
If the swirls flatten in the oven and do not rise, the spinach filling almost always had too much water. This is either because the heating time was too short, or the frozen spinach was not fully thawed, so the ice only melted during heating and there was no time left for the steam to escape. We therefore thaw the spinach the evening before in the fridge, or at midday at room temperature in a sieve so that excess thaw water can drain away immediately.
If the swirls rise but stay soft and doughy inside, the oven was too cool or the swirls were cut too thick. One centimetre is the upper limit. At two centimetres, the centre takes longer than the outside can tolerate, and the result is dry on the outside and sticky in the middle.
If the cheese runs out of the swirls during baking, either too much was used or the swirls were not spaced apart on the tray. 200 g for one batch is the upper limit. More cheese does not make the swirls cheesier, it just means the melted fat runs onto the baking paper.
Other fillings, same method
Ham and cheese instead of spinach: mix 150 g diced cooked ham with 200 g grated Gouda and a splash of double cream. The water-reduction trick is not needed, because ham and cheese are dry enough. Spread directly onto the pastry.
Tomato and Mozzarella: 3 tablespoons of tomato paste with 200 g Mozzarella cut into cubes and a few basil leaves. Note: drain the Mozzarella from its brine thoroughly, otherwise the same water problem occurs as with spinach.
Sweet version with apple and cinnamon: cook 2 grated apples with 50 g sugar and a teaspoon of cinnamon in the mixing bowl for 5 min / 100°C until no free water remains in the bowl. Same method as for the spinach. Instead of cheese, scatter pearl sugar over the top before baking.
Anyone who wants to offer two flavours can cut the puff pastry in half and fill each half differently. One pack becomes two smaller rolls with six swirls each, which fit side by side on one baking tray. We do this when the children want ham and cheese and we prefer spinach ourselves.
What to serve alongside
Warm from the oven, a simple mixed salad is all you need as a side. We like to make a quick Chili Cheese Swirl Mix on evenings when several varieties are requested, or bake Thermomix® pizza rolls in parallel for the family members who do not like spinach. Anyone who eventually wants to make the puff pastry from scratch rather than buying it from the chiller aisle will find a detailed step-by-step guide in our Mix Baking Book for the Thermomix®, which also covers pizza dough and other basic pastry recipes.
Leftovers, lunchboxes and the microwave
Leftover swirls keep for about two days in an airtight container in the fridge. The next day they taste great cold straight from the box, which makes them a classic for lunchboxes or picnics. For a warm version, microwave them for 30 seconds at full power and they will soften slightly as the cheese melts again. For a crispier result, reheat in the oven at 150°C for 5 minutes, though that effort only pays off when reheating several swirls at once.
Freezing after baking only works with reservations. The puff pastry turns soft after thawing and loses its crispness. A better approach: freeze the unbaked swirls briefly on the tray, then transfer to a bag. Bake directly from frozen in a 200°C oven for 5 minutes longer, without thawing first.
Also worth trying: homemade Taco Chips with the Thermomix®.
The complete recipe with all ingredients, quantities and steps is in the recipe card below, ready to print or save.
