Melt the butter in a large stock pot over medium heat. Add in the carrots, onion, and garlic. Season with the curry powder, salt, ginger, coriander, and pepper.
2 tablespoons unsalted butter, 3 medium carrots, 1 medium yellow onion, 1 garlic clove, 1 1/2 teaspoons kosher salt, 1/8 teaspoon black pepper, 1/2 - 1 tablespoon curry powder, 1/2 teaspoon ground coriander