Butterfly Walnut Kernel Manufacturers Butterfly walnut kernel,Nourishes the kidney, strengthens the essence and strengthens the waist, warms the lungs and relieves asthma, moistens the intestines and relaxes bowel movements. Butterfly walnut kernel.A delicious snack eaten raw, used in baking or to top salads, cereal, yogurt or porridge. They also taste great when mixed with other nuts and dried fruit. In particular almonds and raisins.