Step 1

French Onions: Melt 1/4 cup butter in large deep pot or skillet over medium-low heat until sizzling. Add onions, salt and black pepper. Cook uncovered without stirring for 15 minutes. Continue cooking, stirring periodically for 1 hour or until onions are dark golden brown.

Step 2

Increase heat to high. Add wine or chicken stock cooking until the liquid has evaporated. Remove from heat place onto a platter and keep warm. (This can be done in advance and chilled until assembling. When doing so reheat gently before making the grilled cheese.)

Step 3

To make Au Jus: Meanwhile, in the same skillet used for onions, add butter and garlic. Cook for 1 minute to soften. Add beef stock, Worcestershire sauce and thyme. Bring to a gentle simmer, then lower the heat and let cook for 35 minutes and reduce. Keep warm.

Step 4

To assemble: Spread 1 side of each bread slice with 1/2 tablespoon softened butter.

Step 5

Lay 4 bread slices on griddle buttered-side down. Top with 1 slice of cheese, 1/4 cup onions and another slice of cheese. Top with remaining bread slices, buttered-side up.

Step 6

To Cook: Fry grilled cheese on a griddle set to 350°F or over medium-high heat in a large non stick skillet on the stovetop. Cook, turning once, for 8 minutes total or until golden brown on both sides.

Step 7

Serve immediately with au jus for dipping.