Wash potatoes thoroughly and cook in boiling salted water for 15 minutes. In the meantime, peel and finely dice onion and garlic. Knead minced meat, onion and garlic. Season with salt and pepper.
Form small balls from the mince and fry them in hot oil for ten 10 minutes. Remove and put aside. Clean and wash the vegetables. Slice the zucchini, cut the tomatoes into eighths and chop the spring onions.
Drain the potatoes and let them drip off. If necessary, cut in half or quarter them. Fry the potatoes, spring onions and zucchini in the cooking fat. Add tomatoes and steam briefly. Pour in the strained tomatoes and stock and cook for five to eight minutes.
Season to taste with salt and pepper. Add meatballs and warm up. Wash basil, dab dry and cut leaves into strips. Sprinkle over the ratatouille.