In a suitably sized frying pan, bring the white wine, clam juice, smashed garlic, chopped onion and butter to a simmer.
Add the leeks and braise for 20 minutes. Allow cool in liquid. Cut lengthways.
In a bowl, whisk together the olive oil and chopped garlic; then place the leeks in this mixture and allow them marinate for 60 minutes.
Preheat grill.
Grill the leeks until golden brown.
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