Wheat and Mushroom Soup

Ingredients

• 250 ml / 1 cup pre-cooked wheat berries*
• 1 onion, chopped
• 2 stalks celery, chopped
• 30 ml / 2 tbsp olive oil
• 3 cloves garlic, minced
• 1 L / 4 cups chicken stock
• 1 can, 540 ml / 19 oz diced tomatoes
• To taste salt and freshly ground pepper
• 1 container mushrooms, sliced
• As required olive oil