Chicken and Tomato Stew with Caramelized Lemon

Name: Chicken and Tomato Stew with Caramelized Lemon
Ingredients: 4 chicken legs (thigh and drumstick); Kosher salt; 4 tablespoons extra-virgin olive oil, divided; 1 large onion, thinly sliced; 6 garlic cloves, halved; 2 tablespoons honey; 1 tablespoon tomato paste; 3/4 teaspoon ground turmeric; 1/2 teaspoon ground cinnamon; 1 (14.5-ounces) can whole peeled tomatoes, preferably San Marzano; 3 cups low-sodium chicken broth; 1 lemon; 1 1/2 teaspoons sugar; 2 tablespoons extra-virgin olive oil; 1 tablespoon toasted sesame seeds; 1/2 cup torn mint; Flatbread (for serving)