I think you at least have incorporate some seasoning. At least a good amount of salt. As if you were making a burger. Maybe breadcrumbs? I dunno I'm in the same boat as you tbh.
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gentlemen …. jfc …..
https://www.seriouseats.com/the-food-lab-all-american-meatloaf-excerpt-recipe
no recipes, eyeball & pray, the primal way