Step 1 Heat oven to 400 degrees. Trim bottom of brussels sprouts, and slice each in half top to bottom. Heat oil in cast-iron pan over medium-high heat until it shimmers; put sprouts cut side down in one layer in pan. Put in garlic, and sprinkle with salt and pepper.
Step 2 Cook, undisturbed, until sprouts begin to brown on bottom, and transfer to oven. Roast, shaking pan every 5 minutes, until sprouts are quite brown and tender, about 10 to 20 minutes.
Step 3 Taste, and add more salt and pepper if necessary. Stir in balsamic vinegar, and serve hot or warm
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