Peel and finely chop the onion. Peel garlic and chop finely. Pour beans into a sieve, rinse with cold water and drain well. Wash, clean and chop the tomatoes.
Heat the oil in a frying pan, crumble the minced meat into it. Fry well while turning. Add onions, garlic and marjoram and fry briefly. Season with salt, pepper, sugar, paprika and chilli.
Add the tomato paste and sweat. Add tomatoes, braise over medium heat for 4-5 minutes. Add corn and beans, season mixture to taste. Meanwhile grate cheese finely. Mix sour cream and cheese.
Separate the egg. Whisk egg whites with a fork. Whisk egg yolk with 2 tbsp. water. Roll out dough and cut in half lengthwise. Cut each strip of dough into 3 rectangles (approx. 12 x 12.5 cm). Place the dough pieces side by side on a lightly floured work surface.
Spread the chopping mass diagonally in the middle so that the free dough corners can be folded over like a bag. Whip one corner over the minced meat mixture, spread the edge of the dough with egg white for about 1.5 cm.
Fold the other edge of the dough onto it and press down lightly.
Place the croissants carefully on a baking tray lined with baking paper. Brush the dough with egg yolk. Spread the cheese and sour cream with a tablespoon on the visible mince. Let it run a little over the dough.
Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 20-25 minutes. Take out of the oven, arrange and garnish with marjoram. Barbecue sauce tastes good with it.