Prepare the Bread Mixture: Begin by dicing the three slices of white bread and removing their crusts. Place the diced bread in a bowl and pour in the milk or cold water. Let it sit until the bread absorbs the liquid and becomes soft.

Combine Ingredients: In a large mixing bowl, add the soaked bread mixture along with the lean ground beef and regular ground beef. Incorporate the shredded parmesan cheese, minced garlic cloves, chopped parsley, sea salt, black pepper, and large egg into the bowl.

Mix Thoroughly: Using your hands or a spoon, mix all ingredients until combined but be careful not to over-mix as it can affect the texture of your meatballs.

Form Meatballs: Take portions of the mixture and roll them between your palms to form evenly sized meatballs—about one inch in diameter works best.

Cook the Meatballs: Heat olive oil in a skillet over medium heat. Once hot, carefully place each meatball into the skillet and cook for about five minutes on each side until they are golden brown and cooked through.

Serve and Enjoy: Once cooked, remove the meatballs from heat and let them rest briefly before serving them as an appetizer with marinara sauce or as a hearty main course alongside pasta or salad.