26 September 2026
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THE UNIVERSAL GASTRONOMY AUTHORITY
World Kitchen Journal
Kale sheet cake
The Kitchen
By Jean-Luc Moreau, the Technique desk · Netherlands · 1 min ·

Kale sheet cake

Flammkuchen is a German dish that resembles a type of pizza, but is much thinner. In the past, Flammkuchen was used as a test to see if the oven was hot enough. If it was baked to a beautiful golden brown, then the oven was perfect. The translation of Flammkuchen is therefore "burning dough".

Ingredients · Servings 4 people
  • 2 rolls of flammkuchen dough
  • 200g fresh cream
  • 300 g kale
  • 200 g mushroom mix with fresh oregano and thyme
  • 2 tablespoons extra virgin olive oil
  • 2 tsp chili flakes
  • 100 g unroasted hazelnuts
  • 2 rode ui
  • 4 tbsp balsamic vinegar
  • 2 tablespoons sugar
  • 100 g soft goat cheese
  • baking sheets
  • rasp
Method · 45 min
  1. Preheat the oven to 200 °C.
  2. Roll out the flammkuchen dough with parchment paper on 2 baking sheets.
  3. Spread the crème fraîche using a spoon. Distribute the kale over the flammkuchen.
  4. Tear the mushrooms into pieces, slice the button mushrooms, and distribute them over the kale. Strip the herbs from the stems and sprinkle them over.
  5. Drizzle the tart with 4 tablespoons of olive oil and sprinkle with chili flakes. Bake in the oven for 15-20 minutes until golden brown.
  6. Meanwhile, cut the red onions into half rings. Heat 2 tablespoons of olive oil in a frying pan and sauté the onions for 10 minutes.
  7. Meanwhile, roughly chop the hazelnuts and fry them along with the onions for the last 3 minutes.
  8. Add the sugar and deglaze the pan with the balsamic vinegar. Let it caramelize for about 1 minute while stirring.
  9. Spread the caramelized onions with hazelnuts over the kale sheet tart. Sprinkle the goat cheese over it and cut into pieces.

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