Process the prawns, garlic, salt, flour, sherry in the food processor till smooth, or desired consistency (if you want prawn chunks). If not using food processor, chop prawns and combine rest of ingredients.
Mix in the chopped spring onions.
Transfer into bowl, cover with cling wrap and let stand for about an hour.
Heat oil in pan (about 2 inches), drop prawn cake batter in drops of 1 heaping tablespoon and cook for about 2 minutes for each side, or until golden brown.
Drain on rack/paper towels.
Serve warm. You can squeeze lime on top of the cakes before eating. The cakes are yummy with chili sauce as well.