blackberry-topped cheesecake

the beauty of a no-bake cheesecake is that it demands a lot less mathematical respect compared to baked cakes and yeast breads - you can fiddle with the amount of biscuits to suit your preference for the thickness of the crust; change the size of the pan to suit what you have on hand; alter the amount of cheese or cream to suit your taste, or, indeed, to use up what you have left. which is what i did: in a bid to not have any leftover whipping cream, i used the whole packet, which contained about 60% more than what was required. do all that, and the cheesecake still comes out perfect.

so, this is a spin-off from the strawberry-topped cheesecake by nigella. with blackberry jam this time, because it was lying around the house.