Wet age the quarters on the bone if possible. Night and day difference on tenderness. BTW the flat iron steak is the BEST cut on an elk. I do whatever I can to avoid shooting the scapula now. But after wet aging my last 3 elk that way, I will never go back.
I usually pull the fillets and backstraps and process them first. Followed by items that are mostly ground (neck, rib meat, front quarters, etc) and I usually save the rear quarters for last.
Garlic and Onion are staples in my cooking, so removing them would be tough but I would just look up ground beef recipes and experiment. Removing ingredients your wife cannot eat or finding substitutes.
- Lettuce Wraps (
https://www.foodnetwork.com/recipes/ellie-krieger/lettuce-cups-with-tofu-and-beef-recipe2-1953242) just remove garlic / onion from recipe
- Could you make your own marinara sauce without garlic / onion?
- Meatloaf removing items you can't eat?
- Brown meat properly (get it completely dry, look up process - most people unintentionally "boil" their meat in a pan since it has water on it)