I doubled this because 1 1/2 pounds didnt look very big and I wanted to have leftovers. Spread the cream cheese mixture mostly in the middle and tried not to get close to the edges of the ground round. Pinching together the layers was easier and I didnt seem to have a lot of cream cheese mixture coming out. I used grainy mustard and it worked well, just right with the zip of the horseradish. The only thing I would like to have tasted was some flavor in the ground round, maybe onion and garlic or herbs.
A great tasting recipe that is easy to make. If you are not a horseradish fan like myself, substitute it with something else that you like or leave it out completely.
This was, all in all, a really good recipe. My only problem, was that it shrank up so much, and I had a very hard time pinching the edges together. In the end, I had two "hamburgers" with the sauce in between. The total size was about 6" round and fed my family of 3 (including myself). Still good though, and will probably make it again.
This was so easy to make. I had some left over and was going to make it for my husband for lunch the next day but when I looked in the frig I realized he'd gotten up during the night and finished it. He really liked it. Thanks for sharing yor recipe.