Red lentil and vegetable soup - Noralicious

Ingredients

• butter for frying
• 2 red onions
• 2 cloves of garlic
• 1 teaspoon cumin powder
• 1 teaspoon salt
• 1 teaspoon sweet pepper powder
• 1 tablespoon tamari or soy sauce
• 1 small tin tomato purée
• 3 carrots
• 3 celery sticks
• 2 red sweet peppers
• 250 g red lentils
• 1 l water
• 4 tablespoons yogurt
• 1 handful chopped coriander