Preheat oven to 225 degrees Celsius. Wash eggplants, prick of the fork. Put aluminum foil on the grill and bake for 30-40 minutes. Turn from time to time. Slightly cool eggplants, peel them. Chop finely the flesh with a knife, add the lemon juice. Peel garlic, chop, add to the eggplant, season with vegetable oil and mayonnaise, salt and pepper and add sugar to taste. Cool before serving.