I don't buy ground beef and I don't trust my wife to buy it either. Last time she bought some it tasted old. Most of the ground meat we buy is pork, which she uses for a lot of Chinese dishes. My favorite is eggplant, which is sliced in quarters and stir fried with some ground pork, garlic, and sweet and sour sauce. MMMMM my mouth is watering just thinking about it.
I thaw out a venison roast and grind it fresh when I need ground red meat for burgers, chili, or spaghetti sauce. I mix it with olive oil to make burgers.
I make my burgers with ground venison and pork, we call them 2 critter burgers.