Cesar's original arctic char tartare suffered from judges noting it needed some acidity to cut through that sweetness, demonstrating how critical acid balance is when working with rich fatty fish like arctic char or salmon. Raw fish preparations require aggressive acidity to cut through the natural oils and richness of the fish, prevent the dish from feeling heavy or cloying on the palate, and provide brightness that makes flavors pop rather than muddle together. The correction to Cesar's dish involved dramatically increasing the acidic components in the accompanying salsa by boosting lemon juice from 1-2 tablespoons to 3 tablespoons and adding 2 tablespoons of white wine vinegar that wasn't in the original recipe. This dual acid approach works because lemon provides bright citrus notes while vinegar adds sharper cutting power, creating layered acidity that maintains brightness throughout the eating experience. When working with fatty fish like arctic char, salmon, or tuna in raw preparations, aim for about 1 tablespoon of acid per 4 ounces of fish when the acid is incorporated directly, or provide generous acidic accompaniments on the side that guests can apply liberally. The phrase keeping it bright keeping it acidic should guide your approach to these dishes. Additional techniques for proper acid balance include incorporating capers or pickled elements for briny acidity, using fresh herbs like dill and cilantro which have natural brightness, adding mustard which provides both acidity and emulsification, and avoiding sweet components like romaine puree or sweet custards that compete with the savory fish profile. Judges explicitly stated preference for sweets after the fish course, reinforcing that savory fish preparations should remain decidedly savory with acid as the primary counterpoint to richness rather than sweetness. When tasting your dish, if it feels heavy, coating your mouth, or lacking vibrancy, you need more acid. The fish should taste clean, bright, and refreshing rather than rich and heavy.