In the summer, cover the roast with thick slabs of sliced ripe beefsteak tomatoes.  The tomato flavor bakes into the roast and gives a wonderful taste!

Also, impregnate the roast with freshly sliced garlic (not the stuff you get in a jar).  You can do this by delving the knife into the roast to make a space for the slivers of garlic, and then just push the slivers in.  My mom did this and there was a piece of garlic every inch or two or so.  Yum!

Between that and the tomatoes, your taste buds will be happy!