Preheat oven to 350°F. Butter a baking dish
just large enough to hold the onions. Cut the unpeeled onions in half
lengthwise through the root and stem ends. Cut a thin slice off the
rounded side of each half so that it will sit upright in the baking
dish. Arrange the onion halves, cut side up, in the prepared baking
dish. Season with salt and pepper, and place 1 teaspoon of butter
on each half.
Cover and bake 45 to 50 minutes or until onions give slightly when
the edges are squeezed together between your fingers. Uncover and
sprinkle each onion half with 2 teaspoons of balsamic vinegar (use
a fork to spread the onion layers apart so that the vinegar can dribble
down between the layers). Bake, uncovered, another 15 minutes. Remove
from oven and serve hot or at room temperature.
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