Cut the eggplant into cubes and cut the mushrooms into slices or quarters. Peel and dice the onion.
Cook the pasta according to the instructions on the packet.
In the meantime, heat the oil in the pan and fry the onions, aubergines and mushrooms one by one. Halve the tomatoes and add. Season to taste with salt and pepper. If you like, you can add a little powdered vegetable stock.
Drain the pasta well and mix well with the vegetables. Please do not add any water. The vegetables give off enough water.