In a bowl, combine flour, sugar, baking powder, salt, lemon zest (if using), and cubed butter. Rub the butter into the dry ingredients until sandy and crumbly.
Add egg, yolk, vanilla, and knead lightly to form a soft dough. Add sour cream if it’s too dry.
Wrap in plastic and chill for 30 minutes.
2. Assemble the Tart:
Preheat oven to 180°C (350°F).
Roll ⅔ of the dough and press into the bottom of a greased 9-inch tart pan or square pan.
Spread jam evenly over the dough base.
Roll remaining dough and cut into thin strips to create a lattice pattern on top.
3. Bake:
Brush lattice with egg yolk if desired.
Bake for 30–35 minutes until golden brown and set.
4. Cool and Serve:
Let cool completely before slicing.
Optional: Dust with powdered sugar for a pretty finish.
☕ Serving Tip:
Hungarian tart is even better the next day as the flavors meld together. Perfect with afternoon coffee or tea.
Would you like a version with ground walnuts or poppy seeds mixed into the dough?
