Put the tomatoes, walnuts, a clove of garlic and a good dash of olive oil in a blender and make a pesto. Season with salt and pepper.
Dice onion and garlic, sauté in a little olive oil in a pan until translucent and deglaze with a little vegetable stock. Then add the spinach and cook for a few minutes until it collapses. Season with salt and pepper.
Spread the puff pastry on a baking sheet and brush generously with the tomato pesto. Then spread the spinach on top and roll the long side into a strudel. Important: Put the end down on the baking sheet so that it stays nice.
Brush with a little water and bake at 200 ° C top / bottom heat until the puff pastry is golden brown. This takes about 20 minutes.
Optionally, of course, a garlic dip or a tomato sauce is an option; But we also enjoyed it without it.