Beef, Spinach, And Orange Salad Recipe

• 1 1/2 lb all-purpose potatoes
• 1/4 c. red wine vinegar
• 4 tsp Dijon mustard
• 1 Tbsp. extra virgin olive oil
• 3/4 tsp salt
• 1/8 tsp cayenne pepper
• 3/4 lb well-trimmed top round of beef, 1 1/2" thk (or possibly beef sirloin)
• 1/2 tsp dry oregano
• 1/4 tsp freshly-grnd black pepper
• 2 x scallions very thinly sliced
• 1/4 c. brine- or possibly oil-cured black olives pitted, slivered
• 2 x navel oranges peeled, sectioned
• 1 x red bell pepper cut thin slices
• 10 ounce fresh spinach leaves torn

Directions