Aubergine and Ground Beef Casserole

• 4 medium aubergines, sliced
• 1 large onion, coarsely chopped
• butter
• 1½

Sauté chopped onion in 4 tablespoons butter until golden. Add the meat and cook, stirring continuously, until it is browned. Combine the tomato concentrate with the water; add salt and freshly ground black pepper, and pour sauce over meat. Bring to a boil and simmer for 5 minutes. Remove mixture.