Juicy Kangaroo Burger

Name: Juicy Kangaroo Burger
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Australian
Ingredients: 1 pound Kangaroo mince; ½ medium onion (finely sliced); 1 medium egg; 1 big pinch rosemary (or thyme); ½ medium lemon (rind of lemon, or lime – finely grated); 2-3 cloves garlic; 1 pinch salt (to taste); 1 pinch pepper (to taste); 1 pinch spices (to taste); 2 tablespoons olive oil; 1 small bag flaxseed (or breadcrumbs for firmness); 1 small jar Vegemite