This is unlike anything else: the texture is soft set, so you know it's not a liquid but it doesn't have the heft of a solid. And the acidity of the blackberries within the musky sweetness of the jelly is a further thrill.
What I do is to make this in the morning of the evening I want to eat it. It is so straightforward that you can do it groggily at breakfast, no trouble. It doesn't need so long to set, but I find it easier to work like this.
Recipe posted by Nigella