Quick pickle the vegetables. Combine the sugar, apple cider vinegar, and water in a medium bowl and stir until most of the sugar dissolves. Add the sliced onions, jalapeños, and apples and mix well. Set aside for about 30 minutes, stirring a couple more times. Drain thoroughly before adding to the pizza.
Prepare the oven and dough. Heat oven to 450°F with the pizza steel or stone inside. Allow it to heat for 20-30 minutes — essential for a crispy crust. Roll out the dough to approximately 13 inches, shape to fit the peel, and place on a pizza peel dusted generously with semolina flour.
Top the pizza. Spread the crushed San Marzano tomatoes across the dough leaving a border for the crust. Add the ham pieces, followed by the drained pickled apples, onions, and jalapeños. Scatter the mozzarella evenly over the top. If you have ricotta on hand add several small dollops around the pizza as well.
Bake. Carefully slide the pizza off the peel and onto the hot pizza steel or stone — this is always the tricky part! Bake for 12-14 minutes, rotating 90 degrees a couple of times as it cooks, until the cheese begins to brown on top.
Rest and serve. Remove from the oven and allow to rest for several minutes. Cut into pieces and serve.