For the pork steaks:
Pat the pork neck steaks dry and rub with the olive oil, Worcestershire sauce and Cape Herb & Spice Texan Steakhouse Rub. Marinate for at least 30 minutes, or overnight for maximum flavour. Braai over medium-hot coals for about 5 to 6 minutes per side, depending on the thickness of the steaks, then allow the pork to rest for 5 minutes before slicing into thin strips.
For the slap chips:
Cut the potatoes into thick chips and soak in cold water for 20 minutes. Drain well and pat dry thoroughly. Heat the oil to 150°C and fry the chips for 6 to 8 minutes until soft but not golden, then remove and rest for 10 minutes. Increase the oil temperature to 180°C and fry again for 2 to 3 minutes until crisp and golden. Season immediately with the vinegar, salt and white pepper while still hot.
For the mango atchar mayo:
Combine the mayonnaise, chopped mango atchar, atchar oil, lemon juice and black pepper in a bowl and mix well. Taste and adjust the seasoning if needed.
To assemble:
Slice the gatsby rolls lengthways and spread generously with the spicy atchar mayo. Layer with the shredded lettuce, sliced pork, hot slap chips, tomato and white onion.