Definitely read the headnotes for tips and tricks on making this recipe as best as it can be. Once made, this is best eaten straight away, but it's also OK at room temperature.
Get a pan large enough to hold all the scallops hot, set over high heat. While it's heating, pat the scallops dry with paper towels. Add the canola oil to the pan and swirl it around.
When you see the slightest wisp of smoke coming up from the oil, toss in the scallops, moving the pan constantly -- the goal is to toss the scallops in and coat them with the hot oil before they stick to the pan. This should just take a few seconds. Then let the scallops rest undisturbed for 2 minutes. Toss the pan to move the scallops around, then let them sear 1 minute. Salt them as they sear.
Add the garlic and toss to combine. Drop the heat to medium-low and add the butter, one tablespoon at a time. Toss to coat after each tablespoon melts. When it's all combined, turn off the heat, add the parsley, zest and lemon juice and serve.