Bennigan's Hot Bacon Dressing

2 ounces bacon grease
1/4 pound red onion, finely diced
2 cups water
1/2 cup honey
1/2 cup red wine vinegar
2 tablespoons Dijon mustard
1/2 tablespoon cornstarch

Using the insides of the red onion, finely dice. Place the bacon grease in a saucepan over medium-high heat. Add the onions and saut