Grease the tin/ flan dish
Cream the butter and honey until light and fluffy.
Sift the flour and cornflour together and gradually add to the butter mixture. Knead until it comes together, then turn onto the worktop and knead for a further minute.
Spread 2/3 of this mixture over the base of the tin, using your hands. Smooth over with the back of a spoon. Cover the dough with the gooseberries.
Add the walnuts and demerara sugar to the remaining 1/3 of the mixture and knead well. Gently spread this over the gooseberries and smooth out.
Bake for 40 - 45 minutes, until golden brown. Leave to cool in the tin for a few minutes and then cut into squares/ slices.