In a large bowl, add the piece of pork then pour in some Coca Cola until it is fully covered.
Cover the bowl with plastic wrap and let it marinate for 30 minutes.
After this time has passed, in a large skillet over medium to low heat add a drizzle of olive oil.
Add the meat we left to marinate and sear it on both sides.
Remove the meat from the skillet and make a cut right through the center.
In a large skillet over medium to low heat, add a drizzle of olive oil.
Add the onion cut into thin strips, the red bell pepper cut into small cubes, the mushrooms cut into smaller pieces and the bacon cut into strips.
Season everything with the salt, a pinch of black pepper, the oregano and sauté very well for 5 minutes.
Transfer everything to a medium bowl and wait for it to cool down a bit.
When that happens, add the mozzarella cheese cut into cubes and mix all the ingredients well to combine.
Fill the meat with this mixture we prepared by stuffing it completely and to close it, secure it with toothpicks.
Take it to a preheated oven at 180 ° C (350 ° F) and let it roast for 50 minutes.
Serve.