- In a dry frying pan toast the fennel seeds until fragrant, about 1 minute.
- Place into a mortar and pestle and crush. Add the butter, herbs, garlic, zest and seasoning mixing well. Lie a piece of baking paper on the bench, place the butter on it and mould into a log. Wrap, twisting the ends and refrigerate until needed.
- Heat a barbecue to a high heat. Rub the steak with oil and cook for 3 or 4 minutes each side until done to your liking.
- Serve with a slice of butter on top.
Recipe from eatwell.co.nz