Using a vegetable peeler, cut carrots lengthwise into thin strips (you should have about 2 cups). In a medium bowl combine carrot strips, pineapple chunks, raisins, and pecan pieces. Stir together yogurt and orange juice concentrate. Stir yogurt dressing into carrot mixture. Cover and chill at least 4 hours or up to 3 days.
Cut peach or nectarine into thin wedges and toss with carrot salad. Serve on plates lined with spinach or sorrel leaves. Makes 4 side-dish servings.