Start by rinsing the scallops under cold water. Pat them dry with paper towels. This is crucial. A dry scallop will sear properly, forming that beautiful crust. Then, season them with a pinch of sea salt.

Melt the unsalted butter in a saucepan over low heat. Once melted, add the diced onions and sauté until they're soft and translucent. This usually takes about 3-5 minutes. Next, add the minced garlic and sauté for another minute. Garlic burns quickly, so keep an eye on it. Now, add the lemon juice, white wine, and red pepper flakes. Let everything simmer for a few minutes until the flavors meld together.

Preheat your grill to high heat. Using a grill basket or skewer, place the scallops on the grill as soon as it’s hot. Cook them for about 2-3 minutes on each side. The key is achieving a nice golden-brown sear without overcooking. They'll expand as they cook, so give them space. The scallops will turn opaque and firm when done.

As soon as you remove the scallops from the grill, drizzle the warm garlic butter over them. Sprinkle with freshly chopped parsley for that vibrant touch. Serve immediately while they are hot! There’s nothing better than fresh scallops straight from the grill.