I always brown some ketchup in the pan with my onions when I make a pot roast.  I also put it in my meatloaf and then top it with  bacon...now I'm hungry...

Eh, growing up I always had A1 on the side with my pot roast.  It's basically catsup + raisins. 

These days, I make my pot roast with onions, garlic, parsnips, sweet potatoes, and GF beer.  I've done mulling spices before.  A bit of cider goes nicely with that, but not a whole bottle.  And cider, cinnamon, and parsnips result in a waaaaay too sweet venison roast.

Pot roast and ketchup are definitely my thing too!   I'm making pot roast tomorrow.  I actually prefer to make it in the oven but do crockpot sometimes. 
I actually make really good meatloaf...lots of ketchup on that to.  Only Heinz

When we lived in Switzerland, it was called "ketchup."  Perhaps "catsup."  It and mustard came in a tube like toothpaste (we buy tomato paste like that now). A Bulgarian fellow student put it on every.blessed.thing.  I felt like I was eating wiih my brother. 

It's not the product it's the American term "ketchup" eragon used that surprised me.  I'd thought she would have said "tomato sauce" but she probably used the American term for our sake.  When she starts using "flashlight" and "soccer" we know our job corrupting her will be completed.

Right--same here. On the plate.

I grew up with ketchup and pot roast.  I wouldn't have it any other way!  One of my all-time favorites that Mom made.

Guess, I eat the ketchup with the pot roast.  Not as part of the recipe . . .

Now picante sauce on everything--that is me. And my DH and DS. Yes. We could drink Pace Medium straight from the bottle. But I won't out it on pot roast.

Yeah, don't know why. Our ketchup bottle gets very little use throughout the year. I'm not a ketchup on everything person. But I love that tanginess with the roast.

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DH is loving this idea.

ketchup? not tomato sauce?

 THE KETCHUP THING! THATS ME TOO!!!!!
am even after 25yrs my hubby still flinches a little at the sight of the bottle near a roast dinner!

You are going to put it  in When you turn it on, right?  I mean, not just leave it there, then turn it on later?  Then it should be fine.

Thanks y'all. So is it safe to just put the roast in there?  It doesn't spoil?  I've never cooked with meat in my crock pot before.

In the crockpot you do want to add at the beginning.  On the stove, or in the oven, you would add later.  I would use a good all purpose potato, maybe a Yukon gold, or red skinned.  You could buy the baby ones, wash the night before, then just throw them in the pot in the morning.

I think you would add the potatoes at the end.  Just the last 30 mins before serving?  Otherwise, wouldn't they overcook?  But, I don't do pot roast, so don't rely on me!