Horseradish-Crusted Standing Rib Roast with Rustic Grape Tarts | Publix Super Markets

Ingredients

• 4 carrots
• 2 medium yellow onions
• 1 (24 oz) bag baby gold potatoes
• 8 ribs celery
• 2 tablespoons olive oil
• 1 standing rib roast (4–5 lb)
• 1 teaspoon kosher salt
• 1 tablespoon fresh rosemary
• 3/4 cup horseradish sauce
• 1 1/2 teaspoons Worcestershire sauce
• 1/4 teaspoon pepper
• 3 cups seedless grapes (red, white, or mixed)
• Cooking spray
• 2 prepared piecrusts
• 1/3 cup brown sugar
• 1/4 cup all-purpose flour
• 3 tablespoons port wine (or grape juice), divided
• 1/4 cup egg white substitute (or 1 egg white)
• 1 tablespoon coarse sugar