Open-Faced Beef Sandwiches with Greens and Horseradish Cream

Ingredients

• 2 tablespoons light sour cream
• ½ teaspoon kosher salt, divided
• 4 (1 1/2-ounce) slices Texas toast, lightly toasted
• 3 ½ cups vertically sliced onion (about 2 large)
• Horseradish cream:
• 2 cups trimmed arugula
• 1 (1-pound) flank steak, trimmed
• + 7 more ingredients
• • 2 ½ tablespoons drained prepared horseradish
  • ¼ teaspoon freshly ground black pepper
  • 2 tablespoons crème fraîche
  • 1 teaspoon balsamic vinegar
  • Sandwich:
  • Cooking spray
  • 2 teaspoons extra-virgin olive oil

1. To prepare cream, combine horseradish, sour cream, and crème fraîche in a small bowl; cover and chill.2. Preheat broiler.3. To prepare sandwich, heat a large nonstick skillet over medium heat. Coat pan with cooking spray. Add onion and 1/8 teaspoon salt to pan; cover and cook 10 minutes, stirr...

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