Prep the sprouts by trimming the ends of the stem and pulling off the top leaf. Cut each sprout in half lengthwise through the stem. Set aside in a bowl.
Add olive oil to a cast iron skillet. Make sure sprouts are completely dry or they'll splatter in oil.
Place the sprouts in olive oil with the cut side down.
Turn up the heat to medium and fry sprouts until they're golden brown and crunchy (5 minutes).
Try not to move sprouts around too much. Brown them on one side, then flip to the other.
Mix mustard, honey and garlic together in a small bowl. Pour honey mustard sauce over sprouts in skillet and toss.
Turn heat down to medium low. Stir sprouts until the sauce soaks in (5 minutes).
Sprinkle with sea salt and serve warm.
Notes
Be careful when frying in hot oil. If heat gets too high, turn down to avoid splattering.
Can brussels sprouts be frozen? Yes, they freeze very well after being blanched. It's best to freeze them on a sheet pan or baking sheet and transfer to an airtight container or freezer bags. Freeze up to 6 months.
How to store leftovers? Keep leftovers in an airtight container up to 3 days in the refrigerator. Warm up leftovers in the microwave, on the stovetop, or in a 350ºF oven for 10 minutes.