1. Have ready a bowl of ice and cold water. In a saucepan of boiling water blanch herbs 5 seconds and with a slotted spoon immediately transfer to ice water to stop cooking. Drain herbs well and pat dry. In a blender purée herbs with remaining ingredients until smooth. Pour oil through a fine sieve into a bowl, pressing on solids, and discard solids. Oil may be made 1 day ahead and chilled, covered. Bring oil to room temperature before using.