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Since its opening in 1995, Amarin has established its reputation as the Thai restaurant to beat along Castro Street's smorgasbord of Southeast Asian cuisines. The interior is clean and bright, with snowy white table linens kept spotless under glass tops. The 80-seat restaurant is usually packed with health-conscious diners. Amarin means "I shall live forever," and maybe you will if you dine often on Amarin's many vegetarian offerings. There is a separate vegetarian menu in which simulated meat, made from soy bean or wheat flour, is featured prominently. For vegetarians, the red curry is not to…