Recipe:
Flour 300 grams
Butter 100 grams
Sour cream or yogurt 100 grams
Baking powder 1/2 teaspoon
Milk 2 tablespoons
Egg yolk 1 piece

Filling:
Walnut 200 grams
condensed milk 3 tablespoons

Syrup:
Cane sugar 2 tablespoons
Alternatively, you can also use regular sugar
honey 1 tablespoon
Water 50 ml

Bake at 180°C for 30 minutes