Grilled Steak Sandwich Recipe

Ingredients

• ¼ cup mayonnaise
• ¼ cup cream cheese, softened
• 2 Tbsp. sour cream
• 2 scallions, chopped
• 1 Tbsp. chopped fresh tarragon
• 1 Tbsp. tarragon vinegar or white wine vinegar
• ½ tsp. Dijon mustard
• ¼ tsp. anchovy paste
• Salt
• black pepper
• 1 lb. rib-eye or sirloin steak
• Olive oil, salt, and black pepper
• 1 loaf ciabatta, halved lengthwise (12-inch)
• 4 cups fresh spinach (3 oz.)
• 1 cup thinly sliced English cucumber