Here's how to make it

Coleslaw:

In a large bowl, mix the sliced cabbage and grated carrot.
In a separate bowl, mix the mayonnaise, vinegar, sugar, salt and pepper.
Pour this mixture over the vegetables and stir well. Set aside so the flavors can soak in.

Hamburger:

Mix the minced beef in a bowl along with garlic powder, onion powder, smoked paprika, salt and pepper.
Form four large hamburger discs from the mixture. Press a small dent in the center of each burger to ensure they cook evenly.
Grill the pineapple slices on the grill or in a grill pan for about 2-3 minutes on each side, until they have nice grill marks and have softened slightly.
Heat a grill pan or barbecue over medium-high heat.
Grill the burgers for 4-5 minutes on each side for medium. Make sure the burgers have a nice grill mark and are fully cooked.
While the burgers grill, you can lightly toast the burger buns on the grill or in a pan for extra flavor and texture.
Place a burger on the bottom half of the bun. Then place a slice of grilled pineapple, tomato slices and a handful of coleslaw.
Top it off with the Oliehoorn hamburger sauce.
Cover with the top half of the roll.
Serve the burgers with fries, sweet potato fries or a salad.