If a dish tastes flat or heavy and you can't figure out why, the answer is almost always acid. A squeeze of lemon juice, a splash of vinegar, or even a spoonful of yogurt at the end of cooking can completely transform a dish — lifting the flavors, cutting through richness, and making everything taste more vibrant and alive. Acid balances fat and salt in a way that nothing else can. Try finishing your next pasta, soup, or stew with a little lemon juice and notice how dramatically the whole dish comes to life.