Add the tablespoon of oil, and toss. (If using duck fat, zap in microwave for 30 seconds to melt, then stir into the beets.)
Spread beets out in baking dish, and roast in oven for 20 minutes.
Remove from oven, add the maple syrup, stir, then put back in oven.
Roast for a further 20 minutes.
Serve piping hot.
Notes
Instead of maple syrup, you could try balsamic vinegar. Or brown sugar.The duck fat lends a richer taste. Many old time cooks, especially in France, prefer it over oil for roasting.