Step #1 Place zucchini in a colander set in sink, & toss with the 1 tsp coarse salt; let drain 10 mins; press out as much liquid as possible.
Step #2 Whisk egg in large bowl; mix in zucchini, scallions, flour & the pepper until mixd.
Step #3 Heat oil In a large-ish skillet over med-heat/flame; cook fritters in batches; drop mounds of batter (2 tbsps each) into skillet; flatten slightly, until browned, turning once, cook, 4 to 6 mins.
Step #4 Transfer to a paper-towel-lined plate; sprinkle with salt to taste; repeat with remaining batter, serve immediatly, with sour cream.