Preheat the grill or grill pan
Heat a large skillet over low heat and add the olive oil. When the oil is warm add the garlic. Stir the garlic with a wooden spoon and season with salt, to taste. Give the garlic a minute to "melt
" into the oil but do not let it brown. Stir in the bread crumbs, parsley and mint. Taste for seasoning, Set aside.
When the grill is hot, scatter the mussels on the grill in a single layer. Have a pair of tongs and a large platter ready. As the mussels open, use the tongs to remove them from the grill onto a platter. When they are all opened, squeeze the juice from the lemons over them and spoon the bread crumb mixture into the shells. Serve immediately.