Clean and wash the tomatoes, aubergines and zucchini. Cut off a lid from each vegetable. Hollow out the vegetables with a spoon. If necessary, cut them straight at the bottom so that the vegetables stand better.
Finely chop the inside of the vegetables. Peel onions and chop finely. Finely dice the ham.
For the filling, heat 2 tablespoons of oil in a frying pan. Sauté the onions in it until translucent. Add ham and fry well. Add the vegetable inside and fry for about 5 minutes. Add tomatoes and juice, chop a little, bring to the boil and simmer open for about 15 minutes.
Season with salt and pepper. Wash basil, shake dry, cut into fine strips and stir in. Dissolve stock in 1⁄8 l hot water.
Spread the filling into the vegetables and place in an ovenproof dish. Sprinkle with 4 tablespoons of oil. Pour broth around the vegetables. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for 30-40 minutes.
It goes well with rice.