Start by cleaning the mustard greens thoroughly to remove any grit.

Roughly chop the greens into bite-sized pieces.

In a large skillet, heat the olive oil over medium heat.

Add the minced garlic to the pan and sauté for about 30 seconds.

Stir in the chopped mustard greens and season with salt, pepper, and red pepper flakes.

Cook the greens, stirring frequently, until they are wilted and tender, about 3-5 minutes.

Taste and adjust the seasoning if necessary.

Remove the skillet from heat and drizzle lemon juice over the greens before serving.