Spiced Black Lentils with Yogurt and Mint

Name: Spiced Black Lentils with Yogurt and Mint
Total time: 2700 s
Yield: 4 servings
Ingredients: 1/2 teaspoon coriander seeds crushed; 1/2 teaspoon cumin seeds crushed; 1/2 teaspoon mustard seeds; 2 tablespoons olive oil plus more; 1 onion small, finely chopped; 2 garlic cloves finely chopped; 1 cup beluga lentils black; 3 cups low sodium vegetable broth or more, or chicken broth; 1 teaspoon red wine vinegar; freshly ground pepper; kosher salt; 1 cup plain greek yogurt; 1/4 cup fresh mint leaves thinly sliced