Dress greens simply
I like a simple vinaigrette for my greens. Traditional vinaigrettes consist of three parts oil to one part vinegar or lemon juice. But that ratio will vary depending on the oils and vinegars you use and on your own taste. I almost always increase the amount of oil, for example, if I'm using a strong-flavored vinegar.
For the best flavor, use the highest-quality oils and vinegars you can find. Experiment with different varieties of each. Stronger-flavored oils and vinegars, such as nut oils and balsamic vinegar, are best reserved for heartier greens, such as watercress, arugula, and the chicory family.
The secret to making a vinaigrette is that, most of the time, you don't have to make one at all. To make a traditional vinaigrette, the oil is slowly whisked into the vinegar or the two are shaken together in a closed container to create an emulsion. But when making a tossed salad, the greens can be evenly coated without an emulsion. In fact, I usually dress my salad right in its bowl. I sprinkle the greens with salt, pepper, and vinegar, pour in the oil and toss.
But until you learn to judge the right amounts of oil and vinegar by sight, you might need to measure the ingredients into a separate bowl first. One tablespoon oil to one teaspoon vinegar are the measurements to remember for the traditional ratio.