spicy lentil, quinoa and bulgur soup

Ingredients

• - 1 cup split red lentils, rinsed and drained
• - 1 sweet onion, finely chopped
• - 1 small carrot, finely diced
• - 2 tbsp coarse bulgur wheat
• - 1 tbsp red and white quinoa, rinsed and drained
• - 7 1/2 cups chicken stock
• - 4 tbsp tomato paste
• - 1 tsp white sugar
• - 3 tbsp butter (or oil)
• - 1 tbsp dried mint
• - 2 tsp red pepper flakes
• - juice of 1 large lemon
• - sea salt and freshly ground black pepper (to taste)
• - lemon wedges (optional)