Kangaroo burger with the lot

Ingredients

• 500 gram frozen oven-bake chips
• 500 gram kangaroo mince
• 1 onion, grated, plus 2 onions, sliced
• 1/4 cup (15g) fresh breadcrumbs
• 1 tablespoon olive oil
• 4 hamburger buns, split, lightly toasted
• 4 iceberg lettuce leaves
• 8 large slices canned beetroot
• 2 tomatoes, sliced
• 2 tablespoon tomato chutney or relish