:QUOTE [quotetype:personal] The difference between cultured butter and regular butter is the difference between bread and toast. :INFO Why Cultured Butter Tastes Different Culturing cream before churning introduces lactic acid bacteria that convert lactose into lactic acid and diacetyl — the compound responsible for the characteristic buttery, slightly tangy flavor in European-style butter. Most American commercial butter skips this step entirely. Culturing at room temperature for 12 to 24 hours is all it takes to transform the flavor profile dramatically. :COUNTER.half 12 to 24 Hours | :COUNTER.half 35 Percent :PATH Culture the Cream Mix cream with crème fraîche or buttermilk and leave at room temperature. | :INFO Culture the Cream Combine 1 quart of heavy cream (minimum 35% butterfat) with 2 tablespoons of crème fraîche or full-fat cultured buttermilk. Stir to combine and cover loosely. Leave at 65 to 72°F for 12 to 24 hours. The cream will thicken slightly and develop a clean, tangy aroma. Taste it — it should be pleasantly sour, not sharp or off. :PATH Churn the Cream Beat chilled cultured cream in a stand mixer or food processor until butter separates. | :INFO Churn the Cream Refrigerate the cultured cream for at least 1 hour before churning. Transfer to a stand mixer with the whisk attachment. Beat at medium-high speed. It will pass through whipped cream stage and then, typically after 5 to 8 minutes, break into solid butter and buttermilk. You will hear the change — a splashing sound as the liquids separate. :PATH Wash the Butter Rinse under cold water while kneading out all residual buttermilk. | :INFO Wash the Butter Pour off the buttermilk (save it for baking). Add a cup of ice water to the butter in the bowl and work it with a spatula or your hands until the water runs clear. Repeat 3 to 4 times. Residual buttermilk causes butter to spoil quickly — thorough washing is what gives it shelf life. :PATH Season and Pack Add salt if desired, then pack into ramekins or molds. | :INFO Season and Pack For salted butter, add 1/4 teaspoon fine sea salt per 4 oz of butter and work in thoroughly. Pack into ramekins, roll in parchment, or press into a butter mold. Refrigerate for immediate use or freeze for up to 3 months. Cultured butter keeps 2 to 3 weeks refrigerated if well washed. :CHECKLIST What You Need [ ] 1 quart heavy cream — minimum 35% butterfat [ ] 2 tbsp crème fraîche or full-fat cultured buttermilk [ ] Stand mixer, food processor, or jar for churning [ ] Large bowl of ice water for washing [ ] Fine sea salt (optional) [ ] Parchment paper or ramekins for storing :NOTE Fat Content Is Not Negotiable Cream below 35% butterfat will not churn into butter — it lacks the fat globules needed to coalesce. Ultra-pasteurized cream works but produces a flatter flavor than pasteurized. Avoid any cream labeled "ultra-high temperature" if you can. Farm-fresh or non-UHT pasteurized cream makes the biggest difference in final flavor. :QUOTE [quotetype:personal] Cultured butter on good bread needs nothing else. That is the whole point. :LINK https://www.seriouseats.com/homemade-cultured-butter-recipe Serious Eats — Homemade Cultured Butter Recipe and Method