Green Onion Dressing:
1/2 cup olive oil
1 bunch green onions (scallions), trimmed, white bottoms and green tops separated
1 small clove garlic, chopped
1 1/2 tablespoons white wine vinegar
1 teaspoon Dijon mustard
2 tablespoons sour cream
Salt and freshly ground black pepper

Pasta Salad:
12 ounces bow tie pasta, cooked according to package directions
3 teaspoons vegetable oil
1 red onion, cut into 1/4-inch thick rings
1 red pepper, seeded and diced
1 yellow pepper, seeded and diced
1 orange pepper, seeded and diced
1 cup chopped fresh parsley
Salt and freshly ground black pepper
1 cup shredded unsweetened coconut, toasted