Taste a leaf before you cut the lemon
Take a leaf from the salad you plan to dress and taste it plain. A tender lettuce leaf may be mild and faintly sweet. Radicchio can carry a bitter finish. A piece of shaved cabbage may have both sweetness and a sharp mustard edge. These differences are easy to forget when you are standing over a bowl of oil and lemon juice. That first bite gives you something useful to compare with the dressed salad.
Then taste a tiny drop of the lemon juice diluted with a little water. Some lemons have a clear fragrance and a short tart finish. Others make you feel the acidity immediately and leave very little sweetness behind. If the juice tastes unusually harsh, start with less of it. The oil can carry some lemon zest instead, giving you the fresh scent without pushing the acidity farther.
Take a second bite of the leaf if you are adding cheese, olives, or salted nuts. Taste those things together before putting much salt into the dressing. The leaf itself may still need seasoning, but a small portion of a salty topping can do more than you expect. For a green salad served alongside a rich dish, a sharper dressing can be welcome. For a main bowl that already includes pickled vegetables, a gentler dressing may give the other ingredients more space.
Mix just enough to make several tests
For a small salad for two, put a tablespoon of lemon juice in a bowl and stir in a pinch of fine salt. Add half a teaspoon of Dijon mustard if you want a little bite and a mixture that holds together while you toss. Whisk in two tablespoons of oil, starting with only a little and adding the rest in a thin stream. Olive oil can contribute its own flavor. A mild olive oil or another neutral oil lets the lemon be more apparent. Taste the oil beforehand if the bottle is new to you.
You can shake the dressing in a small jar with a tight lid. Add all the ingredients, shake vigorously, and look for a cloudy, even mixture with no large pockets of oil. Set it down and see whether it separates right away. A dressing can still taste good if it needs another shake before serving. Mustard helps it stay together for longer, but the amount that tastes right for the salad matters more than keeping the jar cloudy throughout dinner.
If you prefer a dressing without mustard, dissolve the salt in the juice before adding oil. Whisk just before the dressing goes on. A little finely grated lemon zest can go in at the end, where its flavor will still be noticeable. If a recipe normally calls for more lemon than you want, a few drops of water can help the mixture spread without adding more acidity. Add water sparingly. A watery dressing sits at the bottom of the bowl and is hard to take back.
Adjust from a dressed bite
Dip a corner of a leaf in the dressing or spoon a little onto one slice of the vegetable. Taste it the way the salad will be eaten. A dressing that seems too tart on a spoon can be just right on a broad lettuce leaf. A dressing that tastes balanced by itself can become quiet next to bread or a bowl of cooked grains. After the first taste, choose a single adjustment. Add a small splash of oil if the tartness is covering the leaf. Add a few drops of juice if the flavor ends in a heavy oiliness. Stir or shake again before retesting.
If the dressing seems flat, try a small pinch of salt in a separate teaspoon of dressing before adding it to the jar. This works especially well when you cannot tell whether the dressing needs more lemon. Extra acidity makes the next bite sharper. A little salt can make both the lemon and the oil easier to taste. Once you know which effect you prefer, adjust the rest of the mixture to match.
A hint of sweetness can be useful with bitter greens, but it need not make the dressing taste sweet. Put a drop of honey or maple syrup in a spoonful and try it on a leaf. If you like the result, scale that change into the bowl a few drops at a time. You can also choose a sweet salad ingredient, such as pieces of ripe pear, and leave the dressing fairly sharp. The right finish can be somewhere on the plate other than in the jar.
Get the vegetables ready before tossing
Wash greens and dry them well in a salad spinner or with a clean towel. Pay attention to the folds, where water can collect and later dilute the dressing. If you are washing more than you need, dry and store the remaining leaves according to the ingredient before setting out the bowl for dinner. A leaf that feels wet when you pick it up is unlikely to hold an even film of dressing. It will also be hard to tell whether the vinaigrette was too thin.
Cut ingredients to a size that makes a reasonable forkful. A whole large leaf can pull the garnish off the fork. Very fine shavings can gather at the bottom of a bowl. Mix the larger leaves with their neighbors first so you can see which pieces need cutting. If the salad has sliced cucumbers or tomatoes, add them at the end when you want their juice to remain distinct from the vinaigrette. For a tomato salad, that juice can be part of the dressing. In that case, taste after the tomatoes have been tossed and adjust the lemon only when you see how much liquid they added.
Start with less dressing than you think you need. Spoon it across the side of a large bowl and turn the greens through it. Lift from the bottom so the leaves at the edge get a thin coat too. Once the leaves shine lightly, check the bottom of the bowl. If there is plenty of liquid there, toss again before adding more. Put a little dressing aside for ingredients that will go on top, such as a spoonful of cooked lentils or a handful of sliced radishes.
Change the mixture when the base changes
For delicate lettuce, keep the dressing smooth and use it just before serving. Finely minced shallot can overwhelm a soft leaf if it lands in a clump. Let a small amount sit in the lemon briefly, then taste the mix before adding oil. The raw onion edge can soften, and the dressing will carry the flavor more evenly. Use the leaf test again because the shallot can make a previously mild dressing taste sharper.
For a dish of cooked grain, use the lemon and oil as a more substantial seasoning. Stir a little dressing through the grain before adding the rest of the salad so it reaches the plain part. Taste the grain on its own, then taste it with the vegetables and herbs. If the grain still tastes bland, adjust that part instead of pouring dressing over the entire bowl. Parsley, mint, or dill can go into the salad directly and keep a brighter flavor than if they sat in a jar for hours.
For roast vegetables served warm or at room temperature, a small amount of dressing can bring back flavors that seemed muted while the vegetables cooled. Spoon it over pieces that have exposed cut surfaces. Taste a carrot and a darker piece of vegetable separately. The same dressing can make a sweet carrot taste livelier and a heavily browned edge taste too sharp. Keep the liquid on the side where people can decide how much they want.
A plate of beans can benefit from two applications. Toss a little dressing through the beans first so the mild centers sit against a seasoned surface. Then put the beans on the plate and finish with a few drops of plain lemon if they need a brighter edge. If the beans are warm, serve soon after dressing them. They will keep taking up liquid and may need a different adjustment by the time the dish has cooled.
Remember what worked on the plate
After serving, make a note of the combination and the most useful adjustment. It might be half a lemon and a mild oil for the lettuce you normally buy. It might be a bit more mustard for a grain bowl, or a squeeze of juice at the table after tomatoes have released theirs. Record the dish alongside the approximate proportions. The same dressing can taste quite different when the salad changes.
If you are saving dressing made ahead, refrigerate it promptly in a clean, covered container and use storage guidance appropriate for its ingredients. Make a smaller fresh batch if you are unsure. A fresh dressing takes only a few minutes once you know what you want. Taste the next batch on a piece of the salad before you pour it, and keep a little in the jar until you see how the bowl looks after tossing. Those two habits will carry you through almost any change in the ingredients.
