Curried Lentil and Vegetable Stew

Ingredients

• 2 teaspoons olive oil
• 1 (8 ounce) package pre-chopped yellow onion
• 2 cups chopped zucchini
• 2 garlic cloves, thinly sliced
• 1 cup chopped, seeded tomato
• 2 Tablespoons curry powder
• 2 Tablespoons unsalted ketchup
• 2 cups unsalted vegetable stock
• 2 Tablespoons all-purpose flour
• ½ teaspoon kosher salt
• 1 (17.6 ounce) package steamed cooked lentils (about 2.5 cups)
• 2 Tablespoons fresh lime juice
• 2 Tablespoons plain whole-milk yogurt
• ¼ cup chopped fresh cilantro