Wash and cut the red pepper into bite-sized pieces.
Finely mince the shallot, garlic and ginger.
Place the pork, green beans, red pepper and mango into the slow cooker insert.
In a microwaveable dish or glass measuring cup, melt the butter in the microwave. Add the flour and microwave for one minute. Whisk and microwave one minute more, until bubbly.
Whisk in the vegetable broth until smooth. Microwave for one additional minute.
Add the minced shallot, garlic and ginger. Add the curry paste, fish sauce, peanut butter and salt.
Whisk until smooth. Pour the curry sauce over the pork, vegetables and mango.
Cover and cook on low power for about 8 hours, or until the pork is fork tender and the sauce has thickened.
Stir in some fresh lime juice. Serve the pork curry over rice and garnish with lime wedges, plain yogurt and cilantro.