Any suggestions how to thicken a delicious--but very thin---lentil soup a friend made for me. She filled it with some good veg (plus I have some freshly cooked okra to add, left from my lunch,) but it needs something to bulk up the broth. (I often add a dollop of sour cream to the top of soups, or a bit of yogurt.) I don't have flour in the house,since, as those who've seen my posts before know (!!), I'm not much of a cook. Any other suggestions would be happily received!