Once you mix that all together and form it into mondo patties, you want to let those patties rest on a sheet pan for about a half hour just to let the flavors meld (and the saltine crumbs hydrate). (This is a good time to slice your mushrooms.)
Then you’ll brown the patties in butter. You don’t have to worry about cooking them through at this point; that will happen later when they simmer in the sauce. You do, however, want to brown the patties in batches since they’re so large.
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