Cut 4 of the lemons into wedges and reserve for serving.

Finely grate the zest of the remaining lemon and juice it.

Combine the butter with the garlic, green onion, and the lemon juice and zest.

Heat a grill to medium heat.

Place the clams directly on the grill, cover, and cook for 6-8 minutes or until the clams open.

Place the clams on a serving platter, dot with the butter mixture, and serve immediately with the lemon wedges.