1) Scrub the beets well. Wrap groups of 2 or 3 beets together in little packets of aluminum foil.

2) Place the packets on a baking sheet and bake at 350 degrees until very tender, about 1 hour.When the beets are cool enough to handle, slip off and discard the skins (using rubber gloves). Halve beets lengthwise and place in a bowl.

3) Whisk together the oil, vinegar, salt and pepper; toss with the beets.

4) Sprinkle with the mint leaves.