Beef Sandwiches with Onion Marmalade

Source: Texas Beef Council

Serves 4.

3/4 pound thinly sliced deli roast beef
1 cup white or yellow onion, chopped
1 cup purple onion, chopped
3 green onions, chopped
2 tablespoons oil
1/4 cup granulated sugar
2 tablespoons cider vinegar
1 teaspoon Worcestershire sauce
1/4 teaspoon salt
1/8 teaspoon pepper
Dash ground gloves
4 French rolls (6-inches)
4 endive or lettuce leaves

To make Onion Marmalade, saut