Cut the unsalted butter into even squares and place them into a heavy bottom, wide saucepan and melt it on medium heat.
Whisk the butter every 1 to 3 minutes. As it melts, the butter will foam up.
After about 5 minutes, you will begin to see the butter turning a darker yellow and less foam will be present. Continue occasionally whisking.
You will smell a nutty, caramel aroma coming from the butter when it's done.
Once you see the butter solids starting to turn a golden brown color (not black), you can remove everything from the heat. Continue whisking a bit while it cools down so it doesn't burn from the residual heat.
You can strain the butter to remove the brown flecks or leave them in. Your browned butter is now ready to use!
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Notes
Ingredient notes: Use unsalted butter so you control the salt in your final dish. A high-quality, European-style butter with a higher butterfat content, like Kerrygold or Plugra, gives the richest flavor, but any butter works.Pan options:A light-colored or stainless steel pan makes it much easier to see the color change as the butter browns. A dark pan works too. You'll just have to rely more on smell than sight to know when it's done.Make-ahead and storage: Once the brown butter has cooled, transfer it to an airtight container. Store in the refrigerator for up to 2 weeks, or freeze in a freezer-safe container for up to 3 months. Let it soften at room temperature before using it in a recipe that calls for softened butter.Substitutions:No unsalted butter on hand? Salted butter works too. Just cut back on any added salt elsewhere in your recipe.Critical do-nots: Don't use high heat. It can burn the milk solids before the rest of the butter has a chance to brown. Don't walk away while it's cooking. It can go from browned to burnt in just a few seconds. Don't judge doneness by color alone. The nutty aroma is just as important a signal as the golden color.