Tie every 1 inch with all Cotton kitchen string. Sprinkle salt.
Wrap in foil and refrigerate overnight.
Mix Harissa Rub ingredients and set aside.
Brush top and sides of beef with warmed honey.
Cover top and sides with rub.
Place on foiled sheet pan with rack.
Preheat oven to 250 degrees and bake for 1-½ to 2 hours until cooked to 115 degrees.
Remove from oven and spray top with non-stick spray.
Put under broiler for 5-10 minutes to crisp up.
Let rest.
Mix Julia's Secret sauce ingredients.
