I love these, both, to eat and make. Recently I found a recipe for microwave oven and I tried it. It was OK. No, it was more then OK. It was great. Basically you need an egg, 4 tbsp of sugar, cocoa powder, flour, oil and water. 4 tbsp of all ingredients. You mix everything well with whisk, I like to add baking soda or powder ( powder is better because of the soda the cake gets some weird colour), and when it is done you put some chocolate in the middle or caramel toffees. Three minutes on max, depending on the oven and the fastest lava cake for your guests is ready. If you have those cups that go to microwave it is even better.