Heat oil in a deep pot over medium-high heat.
Place fish in a food processor and pulse until slightly ground. Slowly add half-and-half and process to combine. Add in onion and the rest of ingredients, and process until mixture is a creamy texture.
Carefully drop spoonfuls of the mixture and fry in hot oil. Turn over the “fish ball’ when it starts to float and take them out when they are a golden brown (about 2 minutes a side…damn good!)