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To keep watercress fresh, wrap it in damp paper towels and place it in a resealable plastic bag. Stored this way, it can be refrigerated for up to 4 days. Just before making the salad, “crisp” the watercress by soaking it in a bowl of ice water for a few minutes, then gently pat dry.

Ricotta salata is a firmer version of fresh ricotta; it is perfect for shaving over salads.

The scallops and vegetables can be poached and refrigerated up to 1 day ahead. Avoid using an oaky Chardonnay, which may add bitterness.

French feta is creamier, milder, and less salty than the Greek version. Arrange this salad on a platter, and let your guests serve themselves.

The raw onions in this recipe become milder the longer they stay in the orange juice and vinegar mixture. For a strong onion flavor, let them soak for about 10 minutes; to make them more mellow, marinate for up to 4 hours.

Celery hearts are the tender, pale-green inner stalks in a celery bunch.

If fresh is unavailable, look for packages of prewashed baby spinach. Blood oranges are named for their vivid red-streaked flesh.

Walnut oil can be found at most gourmet markets. Because it is more delicate than other oils, walnut oil should be refrigerated after it has been opened to keep it from going rancid.

Frico, or “little trifles” in Italian, are very thin and crisp. When sprinkling the cheese mixture in the skillet, don’t worry if there are spaces; the cheese will melt into a lacy whole. In Italy, frico are traditionally made with Montasio cheese, but other cheeses, such as Cheddar, Asiago, and Parmesan, produce excellent results.

This colorful salad can also be served family style in a large bowl; toss the arugula in the vinaigrette along with the beans and tomatoes, and let everyone help himself. Niçoise olives have an appealing nuttiness that complements the peppery arugula.

Look for pumpkinseed oil in gourmet shops or health-food stores.

Wasabi peas are a popular cocktail snack. In this recipe, they are ground and used to encrust goat cheese buttons, providing an innovative alternative to bread crumbs. For best results, slice the goat cheese with a piece of thread.

Oranges are an excellent source of vitamin C. For maximum health benefits, cut or juice them just before serving. Vitamins A and C and iron are also provided by baby spinach.