When it comes to eating ocean vegetables, most of us are only familiar with the sheet of nori that holds our sushi roll together. Most of us would run the other way if presented with a bowl of seaweed salad, but give it a chance; it’s a little-known nutritious delicacy, often not even on the menu at most sushi restaurants. Nishiki Sushi gives you a generous serving of the stuff, more than enough for two people to share. It’s a combination of various shredded seaweed, topped with the house dressing of sesame oil and chili flakes. They also have a Healthy Roll, which is filled with shiitake mushrooms, pickled radish, seaweed, cucumber and spicy radish sprouts rolled in nori and rice. Include a bowl of miso soup (made from fermented soybeans and fish broth) and some green tea and you have a meal that will fill you up quite nicely but not give you the after-lunch heaviness that meat, cheese, pasta and bread will. Nishiki Sushi also has other vegetarian sushi, plus edamame (steamed soybeans), pickled cucumber salad and vegetable tempura. This is the kind of food to eat if you want to maintain good health and a slim body. 1501 16th St., #111, 446-3629.