1) Remove the salmon fillets from the fridge and bring to room temperature 10 minutes before cooking. 2) Melt the butter with the oil in a pan over a medium high heat. 3) Season the salmon fillets and add to the pan skin down, cook for 4 minutes. 4) Turn the salmon over and cook until it feels firm to the touch, about 3 minutes more. 5) Meanwhile steam the asparagus until just tender and drain. 6) Mix the remaining ingredients together to make a fresh summer salsa. 7) To serve arrange the asparagus on a plate, top with the salsa and the cooked salmon. 8) Pour over any butter remaining in the pan and enjoy.