Start by melting the butter in a saucepan over medium heat. Keep an eye on it.
When it starts foaming, add the sage leaves. Cook until the butter turns a golden brown color and smells nutty. This should take about 3-5 minutes.
Then, remove it from the heat. Stir in the lemon juice and season with black pepper. Taste and add salt if need (but usually the salted butter provides enough.)
Video
Notes
This sauce is enough for 8 oz of pasta or 16 oz of gnocchi or ravioli (which are denser so the same number of servings weighs more).Serving: Serve your finished dish with grated parmesan cheese to take it to the next level.Butter: If you prefer to use unsalted butter, add ¼ tsp kosher salt and then add more to taste.