Soak the beans overnight in plenty of water.
The next day, strain and boil in a pressure cooker with plenty of water.
From the time the pressure cooker's valve starts to let steam off let cook for about 1 hour so that they boil and get tender.
Remove the beans from the pressure cooker and strain. Let them stand in a bowl.
Put the onions, carrots, celery (together with the sprigs, finely chopped), the tomato, the olive oil, the sugar, salt, pepper, vegetable stock cubes and about 1 litre of water in the same pressure cooker.
Close the pressure cooker and boil the vegetables for about 15 minutes (after the valve starts releasing steam).
Put some olive oil in a frying pan and sauté the sausages.
Heat the oven at 180 degrees.
Put the giant beans in a deep oven tray, the vegetables and the sausages with their oil on top.
Stir all the ingredients well.
Place the tray in the oven and bake for about 1 hour till all the sauce is absorbed.
Stir the food a couple of times while baking. Serve with crumbled feta on top and hot fresh bread!
