Put the lentils, bulgur wheat (and quinoa, if used), onion, carrot and the chicken stock (or water) together in a pan.
Bring to boil and then on a low heat simmer, stirring occasionally for about 30 minutes or until the lentils and bulgur are tender.
Then add the butter (or olive oil), the dried mint, the red pepper flakes and the tomato paste, mix well and simmer for another 10-15 minutes, until the soup has a creamy consistency.
Add the lemon juice and more water if required, then season with salt and pepper.
Serve hot with lemon wedges and crusty bread aside.
