Preheat oven to 180°C. Line two large baking trays with baking paper. Place fries on one tray and bake for 20 minutes, or until golden brown.

Combine the beef, one of the cans of baked beans, the breadcrumbs and the garlic in a bowl. Shape into four patties.

Spray a large non-stick frying pan with olive oil and set over medium-high heat. Add patties; cook for 4 minutes each side, or until browned and cooked through. Transfer to prepared baking tray. Top the patties with remaining baked beans and cheese. Bake for 5 minutes, or until the cheese melts and is golden brown.

Toast the bread and place on serving plates. Combine the slaw, yoghurt, mustard and the parsley in a bowl. Season well with cracked black pepper. Spoon onto sourdough. Top with a cheesy beef patty and the gherkins. Sprinkle with sesame seeds. Serve open burgers with sweet potato fries.