Cook bacon lardons over low heat until crispy; drain on paper towels and set aside. Sauté onion in frying pan. Cook over medium low heat until softened, about 5 minutes. Sprinkle onion with 1 tablespoon of the flour. Cook and stir for 2 minutes. Add vinegar and sugar; stirring until the sugar dissolves. Season as desired with salt and pepper. Add cabbage and stir until it slightly wilts, about 1 minute. Add reserved bacon. Remove from heat and set aside.
Preheat oven to 300°F. Cut pretzel rolls in half. Lightly brush rolls with a small amount of oil and place face-side down on a baking sheet. Lightly toast rolls in the oven for about 5-10 minutes; set aside. Place remaining oil in large nonstick frying pan (enough to cover the bottom of the pan) and heat over medium heat. Slice each can of SPAM® Chopped Pork & Ham into 6 lengthwise slices (for a total of 12 slices). Place flour, eggs and panko crumbs into three separate pans. Dip each slice of SPAM® Chopped Pork & Ham into flour, following by egg and then into the panko crumbs. Sauté the SPAM® Chopped Pork & Ham slices until golden brown on both sides. Place SPAM® Chopped Pork & Ham in warm oven and hold until all slices have been browned.
For assembly, spread the bottom half of each toasted pretzel bun with mustard. Top with SPAM® Chopped Pork & Ham and the cabbage slaw. Top with roll tops and serve immediately. Makes 12 sandwiches.