1. Truffle: Truffle is a precious fungus, which grows in the wild and is worth cherishing when used. Truffles have a unique fragrance, and many high-end restaurants will use it to add color to their dishes.

2. Caviar: Also known as caviar vinegar, it comes from the eggs of silver sturgeon, sturgeon, salmon and other fish, and it tastes delicious. Because the extraction process requires special technology and tools, the price is very high.

3. Pearl powder: Pearl powder is the grinding of pearls into fine powder, which is one of the main components of many skin care products. It has the functions of whitening, moisturizing and shrinking pores. Because it is difficult to obtain and the extraction amount is scarce, it becomes a high-value commodity.

4. Porphyra: Porphyra is a common ingredient in Japanese cuisine, but it is also an expensive seaweed food. Because the picking and processing process is complicated, it needs a pure coastal environment to grow.

5. Lobster: Lobster is a delicious seafood and is usually a frequent visitor to high-end restaurants. Its high price is mainly due to the large breeding area and long breeding cycle of lobsters, and the strong population of mature lobsters is very rare.

In a word, these foods not only have good taste and quality, but also have high production costs in picking and processing, so the price is also high.