3 tablespoons olive oil, divided
1 bunch Swiss chard, thick center stems removed
5 uncooked pork bratwurst sausages (about 1 1/2 pounds)
1 pound small red potatoes, cut in half lengthwise
2 pounds golden beets (about 8 medium), trimmed, peeled, and cut into 1/4-inch-thick rounds
1 1/2 teaspoons kosher salt
1/2 teaspoon freshly ground black pepper
2 teaspoons caraway seeds
Arrange a rack in the middle of the oven and heat to 375°F. Pour 2 tablespoons of the oil on a rimmed baking sheet and brush or rub with a paper towel to coat the entire surface.
Place 2 or 3 large chard leaves on the baking sheet in a rough rectangle whose width equals the length of your sausage (usually about 6 inches), overlapping the leaves so there are no holes. Place 1 sausage at one end of the rectangle and roll the chard around it, ending seam-side down. It will not be flat or neat. Slide the sausage roll to a corner of the pan. Repeat with all the chard and sausages, tucking them next to each other.
Place the potatoes in a row next to the chard-wrapped sausages. Place the beets next to the potatoes. Sprinkle the potatoes and beets with the salt and pepper. Sprinkle the beets with the caraway seeds. Drizzle the remaining 1 tablespoon of oil over the beets and potatoes and gently toss, keeping the beets separate from the potatoes.
Roast until the bratwursts are cooked through and the tip of sharp knife pierces both the beets and potatoes easily, 40 to 50 minutes.