In a large bowl, gently mix the ground chuck with 1 tablespoon of kosher salt, 1 teaspoon of pepper, 2 tablespoons plus 2 teaspoons of the harissa, cumin, garlic powder and thyme.
Form the meat into eight 3/4-inch-thick oval patties. In a medium bowl, toss the onion slices with the olive oil and season with salt and pepper.
Heat a grill pan. Cook the onions over moderate heat, turning once, until tender, about 10 minutes.
Transfer to a plate and keep warm. Grill the burgers over moderately high heat, turning once, until medium, about 8 minutes. Grill the rolls until lightly toasted, about 2 minutes.
Meanwhile, mix the mayonnaise with the caraway and the remaining 2 tablespoons of harissa; season with salt and pepper.
Spread the mayo on the rolls. Top with the patties, onions, tomato and cucumber; close the sandwiches and serve with Williamson Heritage Shiraz.
Caraway seed, like aniseed, was used by the ancient Egyptians, Greeks and Romans for its digestive properties and is delicious when used with all of the vegetables you would put aniseed in.
Garlic is valued for both its culinary qualities and medicinal attributes and this powder form dissolves readily when added to food making it ideal in salad dressings.