Foil Pack French Dip Sandwiches

unsalted butter, (softened to room temperature)

package au jus gravy mix, (separated)

Worcestershire sauce

dried minced garlic

onion powder

Heavy Duty Foil

long/large (or 2 smaller) baguettes

deli roast beef ((ask for rare, since it's getting cooked))

package pre-sliced (12 slices total) provolone cheese