Slice the lemon into very thin rounds. Remove and discard all the seeds. Pick up the slices, a few at a time, and squeeze them over a large bowl to collect the juice. Then finely chop all the juiced lemon slices (including the rind) and add them to the bowl.
Make the Salad:
Whisk the olive oil into the lemon juice in the bowl. Drizzle the honey around the sides of he bowl - do not mix it in. Add the arugula and pinch of salt, and toss to coat it with the lemon-studded dressing, catching some of the honey on he leaves. Serve immediately.