Beef Banh Mi

Ingredients

• 1 beef Cross Rib Roast, Chuck Arm Roast or Chuck Shoulder Roast, cut into 1 inch pieces (about 2 pounds)
• 1 cup thinly sliced carrots
• 1 cup thinly sliced radishes
• 1/2 cup rice vinegar
• 1/4 cup plus 1 tablespoon packed brown sugar, divided
• 1-1/2 cups plus 1 tablespoon water, divided
• 1 tablespoon fish sauce (nam pla)
• 2 cloves garlic, thinly sliced
• 2 slices (1/8 inch) fresh ginger
• 1 tablespoon cornstarch
• 6 Banh Mi or soft hoagie rolls (each 5 inches long), split
• 6 tablespoons reduced-fat or regular mayonnaise
• Thinly sliced cucumber, thinly sliced jalapeño peppers and fresh cilantro leaves (optional)