Combine the jam with the margarine, and mix using a spatula.
Add the cake flour, and mix the margarine and the flour with your hands until it's crumbly.
Bring the dough together, and shape it into a 2-cm thick block. Cut it in lengthwise in half, then cut into 2-mm thick slices.
Place on a baking tray lined with parchment paper. Bake for 25 minutes in a 150℃ preheated oven (adjust the time and temperature to your oven).
Once they're baked, let cool on a rack.
Story Behind this Recipe
My son had a day off today in lieu of parent's day on Saturday. I wanted to give him a freshly baked snack, and so I made this with ingredients on hand. It turned out so nicely that I posted the recipe here.
The cookies won't be nicely browned, since they only use a minimum amount of oil and sugar. For best results, if you have time, chill the dough in the fridge once it comes together and shape it. I baked them immediately, but they turned out nicely.