1 tablespoon olive oil
1 pound uncooked sausage, such as sweet or hot Italian (cut on the diagonal into 1-inch-thick slices)
1 tablespoon balsamic vinegar
1 large yellow onions (cut in half through the stem end, then cut crosswise into 1/4-inch-thick slices about 3-1/2 cups)
1 large fennel bulb (cut in half lengthwise, core removed and outer layer discarded if discolored or very thick, then cut crosswise into 1/8-inch-thick slices, about 2 cups)
5 large garlic cloves (crushed, peeled, and halved lengthwise)
2 cups Earthbound Farm Organic Seedless Red Grapes
  salt (to taste)
2 teaspoons ground fennel seed