Yes in the early 70's my sister Marie Keller was an assistant manager in a Main St. and Inkster Ave location in Winnipeg Manitoba and told us the staff at that time before closing used to have to pre-mix the spices themselves. In the 70's they used Paprika, Season Salt and Oregano with Lipton onion soup mix until it got too expensive and they omitted the soup mix. Try these spices and experiment with the amounts but my now dead mother used to make A&W burger clones that tasted exactly like the restaurants. I laugh my head off when people try to publish online these copy cat recipes for their burgers without the spice mix and they rave how they are almost like the real thing so my advice is make those clones and then add the spices I listed experimenting with the amounts and enjoy the burgers. You can also re-add the soup mix and feed it to an older person that ordered from that era and ask if they taste EXACTLY like the ones from the 70's, They probably will realize how much better they were in the 70's Lol.