Louisiana-Style Shrimp Soup

Ingredients

• • 1 onion, chopped
  • 2 tbsp (30 ml) vegetable oil
  • 1 celery stalk, chopped
  • 1 green bell pepper, seeded and chopped
  • 2 garlic cloves, chopped
  • 1/4 cup (35 g) dark toasted flour
  • 4 cups (1 litre) chicken broth
  • 1 tomato, diced
  • 1/2 tsp Old Bay seasoning (see note)
  • 3/4 lb (340 g) small shrimp (91-110), peeled
  • 1 green onion, chopped
  • Cooked white rice, if desired