Curried Couscous

1 tablespoon unsalted butter

1 1/2 cups boiling water

1/4 cup plain yogurt

1/4 cup good olive oil

1 teaspoon white wine vinegar

1 teaspoon curry powder

1/4 teaspoon ground turmeric

1 1/2 teaspoons kosher salt

1 teaspoon freshly ground black pepper

1/2 cup small-diced carrot s

1/2 cup minced fresh flat-leaf parsley

1/2 cup dried currant s or raisins

1/4 cup blanched, sliced almond s

2 scallion s, thinly sliced (white and green parts)

1/4 cup small-diced red onion