Brown butter appears on every restaurant menu now, draped over fish or vegetables with theatrical precision. Most home versions taste vaguely nutty and occasionally acrid. The confusion stems from terminology: "brown butter" (noisette in French) and "burnt butter sauce" are not the same thing. Brown butter reaches 350°F and tastes nutty. Burnt butter intentionally pushes past this to 380°F, developing deep caramel and bittersweet edge. Getting there without crossing into actual burnt requires controlling the heating surface and monitoring color obsessively. The Technique That Separates Them Use a light-colored stainless steel pan, never non-stick or dark cast iron—you need to see the color change happening. Cut cold butter into quarter-inch cubes and add to medium heat. This slows the melting and gives you a longer window to observe the solids browning. Once you see mahogany color (not dark brown, not black), remove from heat immediately and add your acid: fresh lemon juice, aged vinegar, or capers. The acid stops carryover cooking and adds brightness that prevents the sauce from tasting like charcoal. "Most home cooks add their acid too late or too cautiously," says Lucia Ferretti, chef at Milan's Osteria Francescana. "Burnt butter needs acid to sing. Be generous with your citrus or vinegar—it's the counterpoint." The result: a sauce that tastes intentionally complex rather than nervously over-cautious. Serve immediately over crispy fish, soft pasta, or roasted broccoli.