To prepare a split pea sweet potato soup with mint pressure cooked soups recipe, you'll first need to prepare your ingredients. Peel the sweet potatoes and cut them in half lengthwise. Cut each half into quarters and add them to the pot. Add the water, salt, and pepper to taste. Bring the mixture to boil, then reduce the heat to medium and simmer until the potatoes are tender, about 30 minutes. Remove from heat and stir in the mint.