50 ml (2 floz) 1/4 cupVegetable oil
2 Large onions, chopped
2 Garlic cloves, crushed
6 Tomatoes, blanched, peeled and chopped
4 Celery stalks, sliced
225 g (8 oz) 1 1/3 cups Dried red kidney beans, soaked overnight in cold water and drained
225 g (8 oz) 1 1/3 cups Dried black beans, soaked overnight in cold water and drained
Salt and pepper to taste
1 tsp Sugar
1 Tbs Lemon juice
2 tsp Dried thyme
2 1/2 litres (4 pints) 5 pints Beef stock