Step 1

Preheat the oven to 430F / 220C - you'll need the oven to be quite hot.

Step 2

Put the frozen brussels sprouts onto the baking sheet (no need to thaw them first!), drizzle with the oil and sprinkle with a little salt.

Step 3

Place the baking sheet into the oven and roast the sprouts for 25 minutes or until soft inside and crispy on the outside.

Step 4

If desired, sprinkle with a little parmesan and more sea salt.