Saffron Spaghetti with Santa Barbara Spot Prawns

Name: Saffron Spaghetti with Santa Barbara Spot Prawns
Ingredients: 1/8 teaspoon saffron threads; 2 tablespoons hot water; Kosher salt; 1 pound fresh asparagus, cut into 4-inch spears; 1 pound uncooked spaghetti; 1/4 cup olive oil; 1 tablespoon finely chopped shallot; 1 teaspoon finely chopped garlic; 1/4 teaspoon crushed red pepper; 1 pound unpeeled head-on, tail-on raw Santa Barbara spot prawns (about 12 prawns); 1 cup (8 ounce) dry vermouth or dry white wine; 1/4 cup cold unsalted butter, cut into pieces; 3 tablespoons chopped fresh flat-leaf parsley; 1 tablespoon chopped fresh tarragon; 1 tablespoon thinly sliced fresh chives