Soak peas overnight with water to cover by 2 inches. Drain peas and set aside. In large Dutch oven, saute onion in oil until transparent; add peas, seasonings and chicken stock. Cover and cook slowly until peas are tender, about 30-40 minutes. If made ahead, cover and reheat. For each serving, serve 1/2 cup of peas over 1/2 cup rice.