2 tablespoons olive oil
1 large onion (of any color), chopped
5 cloves garlic, peeled and chopped
1 teaspoon ground cumin
1/2 teaspoon ground tumeric
1/4 pound chopped bacon, pancetta or ham, optional
Coarse salt and freshly ground pepper
1/2-inch to 1-inch piece fresh ginger, peeled and minced
1/2 teaspoon dried red pepper flakes, optional
2 bay leaves
2 cups dried green lentils, picked over and rinsed
4 to 6 cups chicken stock, vegetable stock or water
1 (28-ounce) can crushed tomatoes
4 cups chopped vegetables (cauliflower, carrots, broccoli, leafy greens, etc.)
1 to 2 tablespoons vinegar or lemon juice

Toppings:
Yogurt, sour cream or crème fraîche
Chopped herbs
Chopped onion