Pour boiling water over Porcini mushrooms in a bowl and let stand at least 30 minutes. Meanwhile heat a large skillet over medium-high heat. Add bacon grease and ground venison. Season with salt and pepper. Cook, stirring occasionally until meat is well browned. Pour into a bowl and set aside. Remove mushrooms, reserving broth. Rinse mushrooms under running water to remove any grit. Dice mushrooms and set aside. Strain mushroom broth, using a coffee filter or cheesecloth. Set aside. Add butter and olive oil to skillet over medium-low heat. Add garlic and onion, cook stirring often until softened. Raise heat to medium-high. Add 1 cup water (or reserved pasta water), reserved mushroom broth, tomato powder, and More Than Gourmet Venison Stock. Whisk together until well combined and bring to a boil. Add mushrooms and venison and lower heat to low. Simmer for 15 to 20 minutes.
Serve over bucatini with a sprinkle of Himalayan Pink Salt.