Prepare your fresh lemon juice and mince the garlic (or use 2 teaspoons of the stuff from the fridge; we won’t tell) before you get started cooking. Then put a heavy-bottom pan over medium heat, and cut the butter into a few pieces and add it all to the pan.
Once it's melted, lower the heat to low and add the garlic. Let it cook for about 1-2 minutes, until the garlic pieces are just starting to brown.
Then turn off the heat and move the pan to a cool burner. If using heavy cream, add that to the mixture now and stir it until fully incorporated and the sauce is all the same temperature. Slowly stir in the lemon juice, salt, and pepper (and then slowly drizzle in the cream, if using), then your sauce is ready to use.
This is the perfect lemon butter sauce for pasta, chicken, or fish; we even drizzle it on top of asparagus and steamed broccoli.