Scaling method for shark fins: When scaling shark fins, first separate them by size and tenderness to control cooking times appropriately. This prevents small, tender fins from overcooking while larger, tougher ones remain underdone. Larger, tougher fins typically have thicker cartilage, a sticky texture, and higher quality. However, their larger size, aged skin, and sand particles make them difficult to clean.
Therefore, trim the thin edges of the fins first to prevent grit from entering during expansion. Soak in cold water for 10–12 hours to soften, then boil in hot water for 1 hour. Steep in boiling water until most grit particles swell. Scrape and rinse thoroughly with a spatula to remove grit. If not completely clean, blanch again in boiling water.
Next, separate the shark fins into tough/hard and tender/soft categories. Place each type into a bamboo basket, cover, and steam in a pot. This prevents the fins from breaking apart in boiling water. Steam the tough/hard fins for 5–6 hours and the tender/soft fins for 4–5 hours. After steaming, let them cool slightly before removing the cartilage and steaming again for 1–2 hours.
Monitor the steaming process closely. Once fully softened, remove the shark fins, rinse thoroughly with clean water to eliminate any off-flavors, and set aside. For small, tender mixed shark fins—typically characterized by thin, hard cartilage plates and stubborn sand particles—it's best to steam them more frequently with shorter boiling intervals. First, trim the edges of the fins, then place them in a covered container and soak in boiling water. Once the water cools, replace it with fresh boiling water and continue soaking until the sand particles can be scraped away.
Then trim off the root ends, separating soft and hard sections. Place each type in separate bamboo baskets and steam in a pot for 3–4 hours. Once slightly cooled, remove bones and discard any decayed flesh. Monitor carefully during steaming; only remove when fully tender inside and out. Rinse thoroughly and set aside. Never store rehydrated shark fin in iron containers, as chemical reactions may cause yellow spots, compromising quality.Avoid prolonged soaking of rehydrated shark fin in water to prevent spoilage and off-flavors.
Notes:
1. Exercise strict ingredient selection. Regardless of grade, never use moldy or spoiled shark fin.
2. During soaking, change the warm water frequently—at least three times—to prevent fin deterioration from water contamination.
3. Before stewing, clamp the shark fins tightly between two bamboo mats. This prevents both scorching and deformation/disintegration of the fins.
4. Monitor stewing time carefully. Tough, aged fins require 5–6 hours; tender, soft fins need 4–5 hours.Avoid overcooking, as prolonged simmering may cause surface cracks that allow sand particles to penetrate. Conversely, insufficient simmering prevents removal of the black outer membrane and grit.
5. Simmer over low heat without boiling.If the heat is too high and the water boils vigorously, it may cause the surface of the shark fin to split open, leading to spoilage and sand particles mixing into the fin meat, making it difficult to scrape off the skin and sand. Additionally, before soaking, separate the shark fins based on their size and tenderness to soak them separately. Otherwise, the small and tender fins may become mushy while the tough and hard ones remain under-soaked.
6. Never use iron or copper pots when simmering shark fin. The sulfur-containing proteins in shark fin react chemically with iron or copper, producing compounds like iron sulfide. This causes black or yellow spots on the fin's surface, compromising the final product's quality.For preparing shark fin, it is recommended to use ceramic pots, stainless steel, or similar vessels for simmering.
7. During simmering or after preparation, shark fin must not come into contact with oil, alkali, salt, or similar substances. Otherwise, the fin's surface may dissolve, compromising the dish's quality.
8. After simmering, gently separate the meat from bones and debris using bamboo skewers to maintain the shark fin's integrity and preserve the dish's visual appeal.
9. After removing bones and grit, thoroughly rinse the shark fin repeatedly with clean water to eliminate debris and neutralize any fishy odor.