Mix the lime rind and juice, the seasoning and mace in a bowl. Whisk until the seasoning dissolves, then gradually whisk in the olive oil. Finely chop the spring onion, peel and finely chop the garlic, then add both to the oil mixture. Cut the cheese into cubes (about 2.5 cm/1 in), add them to the bowl and mix well. Cover and leave to marinate* for 1–2 hours.