Halve the aubergines and grill them together with the onion wrapped in aluminum foil in the oven until the aubergines are golden brown.
Let the vegetables cool, scrape the pulp from the aubergine and chop. Peel the onion and cut into small cubes.
The garlic cloves are mashed and mashed together with the grilled vegetables in a blender (whether coarser or finer depends on your own taste).
Stir in the tahini and season with salt, pepper and lemon juice. If the mixture is too thick, add a little water.
Arrange on plates - usually the Baba Ghanug is spread on the plate and decorated with fresh mint leaves (or coriander, if necessary also parsley) and drizzled with olive oil.