There's no such thing as American meat loaf, in fact there is nothing
American about meat loaf... meat loaf has been prepared for centuries
by many different nationalities. The only thing I can think of that
would make meat loaf American is that the typical US home cook drowns
mystery meat in ketchup.
When I make meat loaf the first thing I do is to place my meat grinder
head and a large bowl in my freezer to chill. I'll have one or two
large roasts trimmed and sliced into strips at the ready in the
fridge, could be half beef and half pork, but not necessarilly exactly
half. I'll grind in onion, celery, parsley, bell pepper, carrots,
potatoes, and whatever else I find suitable... grinding in some raw
potato makes for good texture, sometimes not peeled but always scrubed
and de-eyed. I typically add one large egg per pound of meat. I'll
grind in crackers/bread, a minimum amount to hold it together... I
never buy packaged bread crumbs, those are all floor sweepings from
what falls on the floor from their bread slicer. I never add milk,
for moisture I'll add some wine or beer. I don't add ketchup either
but I may add a small amount of canned tomato sauce, or some V8. I've
even ground in some sauerkraut. For me the most important part is to
grind my own meat, no mystery meat here, NEVER!