INGREDIENTS
1
(2 1/2 to 3 pound) beef tenderloin
1
Spinach or arugula
1 tbsp
Horseradish, prepared
1/2 cup
Mayonnaise, store-bought or homemade
1
Mustard, Whole grain
1 tsp
Black pepper, freshly ground
1
Black pepper, Freshly ground
2 tsp
Kosher salt
1
Dinner rolls
3 tbsp
Butter, unsalted
2 tbsp
Whole or 2% milk