1 lb. Brussels sprouts 1 to 3 Tbs. extra-virgin olive oil
1/2 tsp. kosher salt; more to taste Freshly ground black pepper
Fresh lemon juice (optional)
Position a rack in the center of the oven and heat the oven to 475° F. Line a heavy-duty rimmed baking sheet with parchment. Trim the Brussels sprouts, then halve them lengthwise. In a medium bowl, toss the sprouts with enough of the olive oil to coat generously, the salt, and a few grinds of pepper.
Turn the Brussels sprouts out onto the baking sheet and arrange the pieces so that they are evenly spaced and lying on a cut side. If the pieces cover the baking sheet sparsely, arrange them toward the edges of the baking sheet for the best browning. Arrange cut side down on baking sheet. Roast until the sprouts are tender and browned, about 15 minutes (no need to turn them).
Return the Brussels sprouts to the bowl in which you tossed them with the oil, or put them in a clean serving bowl. If they seem a bit dry, drizzle them with a little oil. Season to taste with salt, pepper, and lemon juice, if using.