In a large pot, place peeled and diced sweet potatoes and fill with enough cold water to cover. Bring to a boil, reduce heat to a simmer, and cook the potatoes until soft, about 15 to 20 minutes. Drain and cool potatoes. In a large bowl, combine the cooled potatoes, onion, red pepper, peas, garlic, jalapeno, cilantro, and thyme. Season with salt and pepper and serve cold.