If using wooden skewers, soak them in water for at least 30 minutes.
2
Cut the salmon fillets into 2.5cm cubes. In a medium bowl mix together the oregano, olive oil, salt, pepper, garlic, chilli flakes, and sesame seeds. Add the salmon, toss to combine, and set aside to marinate for 15 minutes.
3
Prepare the barbecue for direct cooking over medium heat (180°C to 230°C).
4
Thread the salmon, asparagus, and lemon slices alternately onto skewers, and then grill over direct medium heat, with the lid closed, for 3 to 4 minutes. Using a metal spatula, carefully flip the skewers and grill for a further 3 to 4 minutes, or until cooked to your liking.