Place flavoured butter ingredients into a small bowl and beat well with a wooden spoon to combine.
Place on a sheet of clingfilm and roll into a sausage, twisting the ends to seal. Place in the freezer to firm up.
Preheat oven to 200C. Coat potatoes in 1 tbsp olive oil and season with salt and pepper. Place in a roasting tray and roast for 20 minutes or until just tender,
Add the asparagus and broccolini, drizzle with the remaining oil and season.
Place the salmon fillets in the tray and top each with a round of the butter.
Roast for 10-15 minutes or until the salmon is cooked to your liking.
Allow rest for 5 minutes before serving. Store leftover butter in the refrigerator for up to 2 weeks (or 1 month in the freezer).
If you share our passion for great food, sign up for regular recipe ideas to enjoy with your family.