Roast Beef Sandwiches (Food Network Kitchens) Recipe - Details, Calories, Nutrition Information | Re

Ingredients

• 1 medium red onion, halved and thinly sliced
• 1 tbsp, plus 2 tsp kosher salt , plus more to taste
• 6 tbsp red wine vinegar
• 3/4 cup mayonnaise
• 3/4 cup sour cream
• 1/4 cup plus 2 tbsp jarred grated horseradish (with liquid )
• 1/2 tsp grated lemon zest
• freshly ground black pepper
• hot sauce
• 6 kaiser rolls
• 12 slices vine-ripened tomatoes
• 24 oz freshly sliced rare roast beef
• 3 loosely packed cups watercress or arugula , or a combination of both
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