Coconut Curry Chicken

In a large pot or high-sided skillet over medium heat, heat oil and butter. When butter is melted, add onion and shallots and cook until tender and translucent, 6 to 8 minutes. Add garlic, ginger, and curry powder and cook until fragrant, 1 minute more. Add tomato paste and cook until darkened slightly, 1 to 2 minutes more. Add coconut milk and water and bring to a simmer. Add chicken and cook, stirring occasionally, until chicken is cooked through, 6 to 8 minutes. Stir in lime juice and garnish with mint and cilantro. Serve hot with rice.