I like to sear the pork before adding it to the slow cooker. I think it adds extra flavor. You can opt to skip this step and the step of sautéing the onions and just put everything in the slow cooker right away if you want to save time. First I generously coat the pork in salt and pepper. Then I heat one tablespoon of olive oil in a skillet over high heat. I add the pork and sear each side until golden.
Place the pork in a slow cooker and pour the barbecue sauce over. Place the lid on the slow cooker and set the temperature to low. Let the pork cook for 6 hours. Then use two forks to shred the pork and stir it into the barbecue sauce. Keep warm.
Now it is time to caramelize the onion. Slice the onion into long thin half circle shaped pieces. Heat 2 tablespoons of olive oil in a heavy bottomed sauté pan over medium low heat. Add the onion and toss in the olive oil to evenly coat the onion. Season with a bit of salt and pepper. Keep a close eye on the onions, you want them to slowly sauté in the pan until they become golden brown. This will take about 30 minutes.
Once your pork and onions are ready it is time to make your pizza. Heat the oven to 375 degrees. Lightly butter a medium sized pan, and unroll the pizza crust onto the and stretch it into shape.
Mince or press the garlic, and place it in a small microwave-safe bowl. Add the remaining olive oil and butter, and microwave until the butter has melted. Then brush this mixture onto the pizza crust. Next add layers of the pulled pork, caramelized onions, mushrooms, and slices of mozzarella and jalapeno.
Place in the oven to bake, it will take about 20 minutes to cook. Serve right away. I recommend serving leftovers with a fried egg on top.