1. Roughly chop the rosemary leaves, thyme leaves, and lavender flower/s or leaves (if using).
2. Place herbs, salt and pepper into a mortar and pound with a pestle, until herbs are crushed and fragrant.
3. Add garlic and lemon zest and pound until garlic makes a paste - add a little of the olive oil if necessary.
4. Now stir in the lemon juice and the olive oil and mix together.
5. Pour mixture into a small screwtop jar. Fix lid securely and shake vigorously until mixture thickens and emulsifies.
6. Pour over meat, cover and marinade in the refrigerator for 1-2 hours before cooking.
7. Pour any marinade left in the bowl over the meat while it cooks.