And morels t'boot...NICE!!!
I like to use Tony Chachere's Original and a bit of file' powder on mine, but other than that, I don't know of a better way to cook 'em than in your picture.
I have had good success in filleting the loin length~wise, cutting about 3/8"->1-2" down the length while rolling it out, leaving one flat peice of meat, instead of butterflying and pounding flat.
Then stuffing it with sauteed (or grilled, or roasted); mushrooms, onion/shallot, garlic, roasted peppers, sun dried tomatoes, jalapenos , and so on. Maybe add some fresh spinach, basil and some parmigiano/romano shavings...whatever fits the taste buds at the time.
Roll it up jellyroll~style, wrap in bacon and grill over medium coals until just barely med/rare.
I believe the knowledgable culinary folks and chef~types call it a "Roulade"...
But...if I had to choose, I'd still go with the medallions...
Brett