In a large, heavy skillet, melt 1 tablespoon of the butter over medium-high heat. Add the bacon and cook, stirring until golden, about 1 minute. Remove bacon from the pan with a slotted spoon. Add 1 tablespoon of the butter, 2 tablespoons of the shallots and the garlic, and cook, stirring, for 30 seconds. Add the chard and cook, stirring, until tender and wilted, about 3 minutes. Remove from the pan and spread on a plate to cool. Wipe the pan clean and melt the remaining 2 tablespoons of butter in the pan. Add the remaining 3 tablespoons of shallots and cook, stirring, for 1 minute. Add the mushrooms and cook, stirring, until the mushrooms are tender and have given off their liquid, about 4 minutes. Remove from the pan and spread on a plate to cool.

In a bowl, toss together the bacon, chard and mushrooms. Add the cheese and mix well. Season to taste with salt and pepper.

Spread the meat flat on a work surface and season the inside with 1 tablespoon of the Essence. Spread the chard filling along the venison, leaving 1/2-inch space along the sides. Roll the meat tightly over the stuffing. With butcher?s twine, tie the roll firmly every 2 inches. Rub the outside of the venison roll with the oil and season with the remaining tablespoon of Essence.

Place in a large roasting pan and cook for 10 minutes at 450 degrees F. Lower the heat to 350 degrees F, and cook until the roast is brown and tender, about 1 hours and 15 minutes to 1 hour and 30 minutes.