Wash Brussels sprouts. Remove wilted leaves and cut an X into the bottom of each sprout. Bring 1” water to a boil in a wide skillet. Add salt and Brussels sprouts. Cover and steam until bright green and tender when pierced with a paring knife (about 6-8 minutes). When done, drain, move to a serving bowl and toss with butter, apple cider vinegar or lemon juice. Season with salt and pepper to taste.