1. 1. Prep the Brussels sprouts. Trim the stem end of each sprout and remove any damaged outer leaves. Halve them lengthwise — this increases the surface area in contact with the brine and speeds up flavor absorption. For small sprouts, you can leave them whole; for very large ones, quarter them.

1. 1. Blanch briefly (optional but recommended). Bring a pot of salted water to a boil and blanch the Brussels sprouts for 2 minutes. Transfer immediately to a bowl of ice water to stop the cooking. Drain well. This step softens the outer layers just enough to help the brine absorb more deeply while keeping the center crunchy.
   2. Pack the jar. Place the garlic, chili peppers, peppercorns, mustard seeds, coriander seeds, celery seeds, and bay leaves into the bottom of a clean 1-quart glass jar. Add the Brussels sprouts, packing them in tightly. If using shallot, scatter the slices among the sprouts as you pack.
   3. Make the brine. Combine the vinegar, water, sugar, and salt in a small saucepan over medium heat. Stir until the sugar and salt dissolve completely, about 3–4 minutes. Remove from heat.

1. 1. Pour the brine. Carefully pour the hot brine over the Brussels sprouts until every piece is fully submerged. Press the sprouts down gently if needed.
   2. Cool and refrigerate. Let the jar cool to room temperature — about 30 to 45 minutes. Seal the lid tightly and refrigerate.
   3. Wait (the hardest part). The sprouts are edible after 24 hours, but they’re significantly better after 48 to 72 hours. For the deepest, most developed flavor and the best texture, give them a full 3 to 5 days before digging in.

Prep Time: 15 minutes | Cook Time: 5 minutes | Total Time: 20 minutes (plus 24–72 hours chilling) Servings: 8–10 | Calories: ~30 per serving Storage: Up to 3 weeks in the refrigerator