Peel and slice onions with the grain (not against grain as you would if cutting for sandwiches) in about 1/4 inch width the full length of the onion. Put the onions in approximately 1 1/2 quarts boiling water. Add Gravy Master. Boil at medium heat for about 45 minutes, until the onions are somewhat translucent. Add Lipton’s Onion Soup Mix (do not cover the pot). Simmer for 30 minutes. Ladle a portion of soup, heavy with the onions, into serving crock. Cover crock with 1 slice of toasted Italian bread, 2 slices of provolone cheese and 1 slice of Gruyère or imported Swiss cheese. Placement of cheese: Put the Swiss in the middle of the 2 slices of provolone. Put under broiler (about 6 to 9 inches from heat). When cheese turns dark and it starts to melt, wait a minute and take from broiler. It's ready to enjoy.