Rehydrate porcini mushrooms in 1/2 Cup hot water for minimum 10 minutes. Bring hamburger up to room temperature.
Stab onion with skewers and cut between to make lollipops. Drizzle with oil and grill, flip with burgers.
Blend porcini mushrooms through pepper in mini food processor or mince ingredients very well and mix well to make paste. Add to hamburger. Make 6 hamburgers. Grill on med high heat for gas grill or direct heat for charcoal 3-6questions.pdf
minute per side. Add Swiss cheese till melted.
Baste buns with butter/oil and toast on grill.
Mix reserve porcini water, minus dirt at bottom with beef consume/ broth to equal on Cup. In small saucepan pan ad water mixture to equal one Cup. Add brown gravy mix. Follow directions to make gravy.
Assemble: bottom bun, burger, onion, gravy, and top bun