A cooked potato is a wonderful teaching tool because it isn’t very complicated. If you try a plain cooked potato, without anything else added, you’ll probably say it feels soft, gentle, starchy, and bland. Sprinkle on salt, and it will suddenly taste like more of itself. Drop on vinegar or lemon juice, and it will suddenly taste brighter and sharper. Drizzle on butter or olive oil, and it will feel fuller. Return the potato to a hot pan and brown it, and the flavor profile will shift toward more toasty, more sweet, more deep. Nothing magical is going on. We are simply observing how one ingredient can react to four very different changes.
Salt is usually the first thing we reach for, and it can work wonders for a recipe when we are careful. It doesn’t just add saltiness: a little salt can make something feel more sweet, it can take the edge off of blandness, it can make flavors feel more integrated. However, problems arise if salt is seen as the ultimate solution for anything that needs a lift. Adding more salt is unlikely to help a dish that tastes greasy, muddy, or dull; it might just make it blonder. To get the most out of salt, taste a small serving of the dish, add a tiny pinch of salt, stir well, taste again, and then ask the real question. It isn’t “Did we add enough salt?” but rather, “Did the main ingredient become more obvious?”
Acid has its own way of brightening a dish. Vinegar, citrus, yogurt, tomatoes, pickled foods, and other fermented foods can make something that tastes rich feel fresh. It can be the right remedy when boiled beans taste muddy, when roasted vegetables taste too sweet, or when a sauce is full but sleepy. However, acid can also take a recipe in the wrong direction if you overdo it. A few drops of lemon juice might make an otherwise dull grain salad lively; too much will simply make every bite taste thin and sour. When experimenting with acid, try to add it to only a small portion of a recipe so that you can evaluate whether it improves a dish rather than making it a complete change.
Fat has an impact on flavor through texture as well as taste. It can make ingredients feel rounder and less acidic. It can also help make a dish smell more fragrant by carrying more aromatic compounds. Adding extra virgin olive oil, butter, cream, cheese, sesame oil, or just more of the cooking fat can make a dish feel more rich. Too much fat in a dish can make a fresh-tasting dish heavy, and fat has a way of covering up bright flavors. This is why a recipe that needs salt might need more acid, and a dish that needs more acid might also need more fat. Salt, acid, and fat are addressing different problems in our food.
Heat is often more than just temperature. It is also a cooking process that can alter the aroma, texture, and color of your food. Roasted carrots will taste different than steamed carrots. The former has the extra element of caramelization on its surface and a much firmer texture than the latter. A simmering sauce will change as it cooks longer and longer, as acidity mellow, water evaporates, and the flavors meld. Heat can improve your cooking significantly, but it can also take the edge off of freshness or overcook your protein or tender vegetables. Watch out for specific things we want, like browning, bubbling, softening, thickening, or resting, instead of simply checking a recipe for how long it says to wait.
One practice that’s helpful is taking a single, mild-tasting ingredient, such as a plain cooked potato or rice, for example, plain cooked white beans, plain cooked zucchini, plain cooked lentils, even a slice of plain bread, and preparing four tiny samples. Take one plain. Add a few tiny grains of salt to a second portion. Sprinkle a few drops of vinegar or lemon on a third. Drizzle a little bit of oil or add a dab of butter on the last. If possible, brown a fifth portion of the same plain ingredient in a dry frying pan to taste it hot. Taste the sample and then write a single sentence describing the sample. I often find that I notice salt makes something taste more obvious; acid tastes fresher and cleaner; fat tastes smoother and softer; and browning tastes richer and more intense.
Comparing samples like these is a good way to learn to approach recipes more thoughtfully. Rather than fix your food by adding whatever is the easiest thing to grab, you are learning how to choose an appropriate tool for each task. A bland dish needs salt. A muddy-tasting dish needs acid. A harsh-tasting dish needs more fat. A pale-tasting dish may just need more browning or just a few more minutes of cooking time. You’ll learn all of this when you make four tiny samples of the same ingredient and change the preparation by one variable at a time and then really observe the changes in the final dishes.