Place salmon in a bowl and break apart with a fork into small pieces. Add garlic, parsley, lemon juice, pepper(optional but hight recommended), onions, bread crumbs and salt and mix well. Add egg and mix well.
Next using a 1/4 cup measuring cup, scoop salmon filling and form into shape with your hands. Repeat until all the mixture is used.
In a heavy bottom frying pan over medium, add oil, about an inch deep. When the oil is hot add the salmon croquettes and fry until golden brown on all sides, flipping to make sure both sides are cooked. Place on a plate lined with paper towel to cool.