Soak split peas overnight, drain the following day and set aside. Dice the ham into half-inch cubes, dice the potato into cubes. Add oil to a large pot,dice onion and add it to the pot. When onions are almost done add garlic, Saute the garlic for a minute, then add the ham, potato,carrots, peas, oregano and cumin. Add four cups of water, bring to a boil, then set the cooking heat to low. Simmer until peas are soft or desired consistency, salt and pepper to taste.