01 -
Grate the zucchini on the large holes of a box grater. Place it in a colander, toss with the kosher salt, and let it stand for 15 minutes.
02 -
Transfer the zucchini to a clean kitchen towel and squeeze firmly over the sink until very little liquid drips out.
03 -
Melt 3 tablespoons butter in a wide skillet over medium heat. Add the shallot and cook for 2-3 minutes, stirring often, until softened.
04 -
Stir in the garlic and cook for 30 seconds, just until fragrant. Do not let it brown.
05 -
Add the squeezed zucchini. Cook for 15-18 minutes, stirring often, until the mixture is thick, glossy, and no longer watery.
06 -
Remove from the heat. Stir in the remaining 1 tablespoon butter, lemon zest, lemon juice, black pepper, red pepper flakes, and herbs. Taste and adjust salt only if needed. Cool slightly before serving or storing.