Slow Cooker Lentil Cauliflower Stew

dried lentils

olive oil

large onion, chopped ((about 2 cups of onion))

garlic cloves, chopped

cauliflower, chopped into very small florets

leeks, white and green parts only, halved, washed carefully, and chopped)

large carrots, peeled and chopped

celery stalks, chopped

bay leaves

chopped fresh thyme or 1 tsp dried thyme

kosher salt ((or to taste))

cumin

cayenne ((very spicy-- add 1/4 tsp or less for a milder flavor))

black pepper

low sodium vegetable broth

diced tomatoes with juice ((1 large can))

chopped kale or Swiss chard

Plain yogurt, herbed goat cheese, feta, crème fraîche, grated Parmesan, Greek yogurt or lowfat sour cream