Mix the flour with the sugar and add the baking soda. Then add the chopped margarine (or grated with a grater).

Mix all ingredients until crumbly. It is most convenient to do this using a blender with a bowl attachment. We will also add salt. The base for the dough is ready.

To prepare the filling, simply mix the filling ingredients together, again using a blender.

Now that we have two mixtures (the crumbly pastry mixture and the smooth filling), let's move on to shaping the royal cake.

But first, let's prepare the mold. Since we don't have a mold of the right size (and it's much easier to remove such delicate pastries from it), we will cover the metal container (its dimensions are 18 x 8 x 5 cm) with well-greased baking paper.

Spread about two-thirds of the crumbly dough into the mold, making sure to make small sides.

Pour the filling on top and smooth it out using a silicone spatula or spoon.

Cover the filling with the remaining crumbly dough.

Place the mold in an oven preheated to 190°C (374°F). After 40 minutes, the royal cheesecake will be ready. Remove it from the mould only after it has cooled completely (otherwise it will fall apart).

Serve this wonderful delicacy cold.