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The secret to great, juicy keftedes is to make the mixture as loose as possible, but still dense enough that the little meatballs will hold their shape when fried. It is common practice in various parts of Greece to add grated tomato or milk, or both, to the mixture. The liquid adds the requisite moisture to the meat and changes its color so that the finished keftedes have a light, pinkish tint when broken apart. Frying the meatballs has its tricks, too. You actually don't need that much oil for this recipe, as the keftedes are pan-fried, not deep-fried. What you will need is to pay attention to the oil. It should not be so hot that the keftedes burn on the outside but remain undercooked within.