Curried Chickpea and Red Lentil Soup

Name: Curried Chickpea and Red Lentil Soup
Ingredients: 1/4 cup olive oil; 1 onion diced, 1.25-1.5 cups; 2 carrots peeled and diced, 1.25-1.5 cups; 4 cloves garlic, thinly sliced; 2 teaspoons ground cumin, see notes above; 1 teaspoon curry powder; pinch red pepper flakes; 1 teaspoon kosher salt, plus more to taste; fresh pepper to taste; 1 cup red lentils; 4 cups cooked chickpeas, or two 15-oz cans, drained; 1/4 cup white balsamic vinegar or lemon to taste, see notes above; 2 cups crushed tomatoes; 4 cups vegetable or chicken stock or water