For a smoother vinaigrette, use a blender or immersion blender to emulsify the ingredients. Infuse the vinaigrette with herbs like thyme or rosemary for added depth. Add the herbs during the whisking process and let them steep for at least 30 minutes before serving. Store leftover vinaigrette in an airtight container in the refrigerator for up to 2 weeks. The oil may solidify, so allow it to come to room temperature or shake well before using.