Pour the beans onto a sieve, rinse briefly under cold water and drain. Peel and roughly dice the onion. Wash and drain the tomatoes and also cut them into cubes.
Heat olive oil in a large pan and lightly fry 2/3 of the onions in it. Add tomatoes and thyme and braise for about 5 minutes. Stir in tomato paste and season with salt and pepper. Add stock and cream.
Add the beans, bring to the boil and simmer covered for 4-5 minutes. Peel garlic and cut into slices. Cut bread slices in half. Heat the fat in a pan and fry the bread together with the garlic.
Season the bean pan with salt and pepper. Crumble the feta. Sprinkle the feta and remaining raw onions over the beans. Sprinkle with fresh thyme. Add garlic bread.