Wash the nail and pound it into the top of can of sweetened condensed milk to make 2 small holes on opposite sides of the top. Remove nail. Place the can of condensed milk into a small saucepan and pour in water to reach high up the side of the can. Bring water to a boil; reduce heat to low. Simmer milk in the can for 3 to 4 hours. Milk will slowly turn light to medium brown and become thicker as it cooks. Add more water as it boils down.
Line an 8x8-inch baking dish with plastic wrap long enough to overhang the dish by several inches on each side. Place broken coating into a large glass microwave-safe bowl and melt on low power in microwave oven, about 5 minutes, stirring after every 30 seconds to 1 minute. When coating is smooth and creamy, stir peanut butter into coating until fudge is thoroughly combined. Spread fudge into the prepared baking dish.
Combine water, pinto beans, onion, salsa, cilantro, jalapeno pepper, garlic, tomato bouillon, vegetable bouillon, chili powder, paprika, cumin, and black pepper in an electric pressure cooker (such as Instant Pot®). Close and lock the lid. Select Bean/Chili function; set timer for 45 minutes. Cooker will reach high pressure in 10 to 15 minutes.
Bring 2 cups of water to a boil in a saucepan over high heat. Stir in the curing mixture, brown sugar, pickling spice, and garlic powder; stir until dissolved then remove from the heat. Pour 6 cups of cold water into a 2-gallon container, and stir in the spice mixture. Place the boneless venison into the brine, cover and refrigerate.