12 ounces 90%-lean ground beef
3/4 cup finely diced red bell pepper
3/4 cup chopped scallions
1/4 cup plain dry breadcrumbs
4 tablespoons hoisin sauce, divided
2 tablespoons minced fresh ginger
3 teaspoons canola oil, divided
4 bunches or 2 4-ounce bags watercress, trimmed (16 cups)
1/2 cup Shao Hsing rice wine, or dry sherry
Place rack in upper third of oven; preheat the broiler. Coat a broiler pan and rack with cooking spray.
Gently mix beef, bell pepper, scallions, breadcrumbs, 3 tablespoons hoisin sauce and ginger in a medium bowl until just combined. Form the mixture into 4 oblong patties and place on the broiler-pan rack. Brush the tops of the patties with 1 teaspoon oil. Broil, flipping once, until cooked through, about 4 minutes per side.
Meanwhile, heat the remaining 2 teaspoons oil in a large skillet over high heat. Add watercress and cook, stirring often, until just wilted, 1 to 3 minutes. Divide the watercress among 4 plates. Return the skillet to medium-high heat, add rice wine (or sherry) and the remaining 1 tablespoon hoisin sauce and stir until smooth, bubbling and slightly reduced, about 1 minute. Top the watercress with the Salisbury steaks and drizzle with the pan sauce.