In a large mixing bowl, add in the ground meat, salt, pepper, 1 raw egg, breadcrumbs, 1/2 diced white onion, chopped parsley and Tabasco sauce
With your hands, mix all the ingredients together. Make sure to blend in all the loose ingredients massaging them into the meat.
Scoop up the mixture to make golf ball sized meatballs. Repeat this until you use up all the meat.
Heat up the grill to 250 degrees and set it up for indirect heat.
Smoke the meatballs on the grill until they reach 145 degrees internal temp.
Remove off the grill to rest.
Fill the sub rolls with the spicy meatballs, pour some marinara sauce, cover with shredded mozzarella and put it back on the grill to crisp up the sami and melt the cheese.