Mix brown sugar, flour, and cinnamon together in a bowl. Stir vinegar, water, honey, and mustard together in a saucepan; add brown sugar mixture and whisk until blended. Turn heat to medium-high, stir crushed pineapple into mixture, and bring to a boil, whisking constantly, until thickened, 2 to 3 minutes.
Pineapple juice can be substituted for the water in the glaze if desired.
Bake ham as directed. Thirty minutes prior to end of baking time, remove ham from oven and score in a diamond pattern. Pour glaze over ham, place back in oven, and bake for final 30 minutes. (Optional: baste with glaze runoff and drippings several times).
Grill 1 can sliced pineapple until just brown. Garnish finished ham with grilled sliced pineapple and 1 small jar maraschino cherries using toothpicks.
Per Serving: 85 calories;0 g fat;
21.8 g carbohydrates;
0.2 g protein;
0 mg cholesterol;
11 mg sodium.