Cowpea, carrot, sweet potato and apple are all ingredients that can be cooked into porridge. Cowpea is a kind of bean food, which can be cooked into cowpea porridge or porridge with other ingredients. Carrot is a nutritious vegetable, which can be used to cook porridge. Sweet potato is a common staple food, cooking porridge. Apple is a kind of fruit. Cook porridge and add juice to porridge to make apple porridge. However, because cowpea, carrot, sweet potato and apple are different in taste, texture and flavor, it is suggested to choose suitable ingredients according to your own preferences.