Clean the savoy cabbage, cut into bite-sized pieces and wash. Peel and wash the potatoes and cut them into slices. Peel and finely chop the onion. Heat the fat in a saucepan. Fry the onions in it until transparent.
Add the cabbage and potatoes, fry briefly and pour on the stock. Stew for about 30 minutes. In the meantime, rinse herbs for the pesto and pat dry. Peel garlic and chop roughly. Dice Parmesan cheese.
Finely chop herbs, garlic, cheese and almonds in the universal chopper. Gradually add olive oil. Season pesto with salt and pepper. Set aside. Wash and halve the tomatoes. Add to the stew and cook for a few minutes.
Season stew with salt and pepper. Divide into four plates, add a little pesto, add the rest.