Peel and dice the tomatoes. Fry the chopped onion in the oil until translucent. Add the tomato cubes, salt and a pinch of sugar and simmer everything until soft, then finely puree. Stir the soaked and squeezed gelatine into the warm tomato sauce.
Peel and roughly dice the avocados and drizzle with lemon juice. Add the chopped garlic and chopped chilli pepper and use the hand blender to make a smooth mixture.
Mix the avocado cream with the tomato puree, season well with salt, cayenne pepper and sambal oil and pour into a dish. Let it set in the refrigerator.