This recipe is adapted from a recipe created by MeMe's Diner (now closed) in Brooklyn, NY. The Mushrooms add wonderful moisture and flavor to meatloaf.
Preheat the Oven to 350℉
Line the Loaf Pan with parchment paper, leaving a few extra inches hanging over the edge. This will make removing the meatloaf much easier.
Place Saute Pan over medium heat and add butter. Once butter has melted, saute sliced onions until they begin to soften - about 2 to 3 minutes.
Add the sliced mushroom and cook until the mushrooms have given up most of their liquid and start to brown - about another 5 to 6 minutes.
Turn the heat off in the Saute pan and let the contents cool a bit while you work on other parts of the recipe.
Lightly beat the eggs in a small mixing bowl. Add the buttermilk, tamari, worchestershire sauce and oats. Mix thoroughly then set aside to soak.
Place the onion/mushroom mixture in the bowl of a food processor. Pulse the mixture until it achieves the texture a rough paste or ground meat.
In a large mixing bowl, add the ground beef, ground pork and processed mushroom/onion mixture. Add 3 Tbls of ketchup. Mix well using your hands.
Add the egg/buttermilk/oat mixture to the meat and mushrooms. Mix again, being sure to evenly incorporate all ingredients.
Transfer the mixture to the parchment lined loaf pan. Press firmly into the pan making sure there are no air pockets. Brush the top of the meatloaf with the remaining 3 Tbls of ketchup.
Place meatloaf in the oven and bake for one hour - until firm and bubbly.
Combine ingredients for BBQ Sauce in a small sauce pan. Bring to a boil, then reduce and simmer for 10 minutes.
When you can comfortably handle the loaf pan (not too hot), use the parchment tabs to lift the meatloaf out of the loaf pan and place on a grooved cutting board. (The grooves will catch the juice.)
Slice the meatloaf. Serve drizzled with Hoisin BBQ Sauce.