Red Lentil Soup with Lemon Mint Yogurt Recipe

Ingredients

• 2 tablespoons butter
• 1 large yellow onion, diced
• 3 tablespoons tomato paste, or more to taste
• 1 teaspoon kosher salt, or more to taste
• 4 cloves garlic, crushed
• 2 teaspoons ground cumin
• 0.125 teaspoon cayenne pepper
• 1 quart chicken broth
• 1 cup red lentils
• 1 rib celery, diced
• 1 large carrot, diced
• 6 leaves fresh mint, thinly sliced
• 1 pinch salt
• 3 tablespoons plain Greek yogurt, or more to taste
• 0.5 lemon, juiced
• 0.5 teaspoon lemon zest