Chef John's Mulligatawny Soup Recipe

Ingredients

• 1 tablespoon unsalted butter
• 1 tablespoon vegetable oil
• 1 1/4 cups boneless, skinless chicken thighs
• 1 teaspoon kosher salt, or more to taste
• 1 tablespoon curry powder
• 1 teaspoon garam masala
• 1/2 teaspoon ground cumin
• 1/2 teaspoon freshly ground black pepper
• 1/4 teaspoon ground mustard
• 1/4 teaspoon ground coriander
• 1/4 teaspoon cayenne pepper
• 4 cloves garlic, minced
• 1 tablespoon finely grated fresh ginger
• 1 large yellow onion, diced
• 2 carrots, diced
• 2 stalks celery, diced
• 1 tablespoon tomato paste
• 1 cup cubed Yukon Gold potatoes
• 1/2 cup seeded and diced tomato
• 2 small Granny Smith apples - peeled, cored, and diced
• 1/2 cup dry red lentils
• 1 bay leaf
• 1 teaspoon tamarind paste
• 6 cups chicken broth
• 3 tablespoons coconut cream
• 1/2 cup plain Greek yogurt, or to taste
• 1/4 cup chopped fresh cilantro, or to taste
• 1/4 cup sliced green onion, or to taste
• 1 pinch red pepper flakes, or to taste