Whip up this classic salad dressing in a jiffy: Whisk 3 Tbsp. olive oil with 1 Tbsp. of your favorite vinegar. Add salt and pepper to taste.
Experiment with different vinegars, like balsamic vinegar or Asian rice vinegar. Taste as you go: Vinegar acid levels vary, so you may have to use more or less oil.
Try other flavors. Add some crumbled blue cheese, lemon peel or minced fresh herbs such as thyme or rosemary to the dressing.
For a quick Caesar, add a bit of mustard, lemon juice and anchovy paste. Toss the dressed salad with grated Parmesan cheese.