Preheat oven to 375 degrees with a rack on the upper third of the oven.
Remove puff pastry from freezer to thaw. Cut into 4 squares (about 4 x 4") once thawed enough to slice.
Distribute the green onions in an even layer onto the puff pastry squares. Sprinkle with salt.
Use a rolling pin to gently press the green onions into the pastry.
Roll each square of puff pastry into a tight cigar shaped log. Take care to keep as much of the green onion inside the pastry as possible.
Coil the cigar log into a snail like circle.
With a rolling pin, flatten the circles to about a 6" diameter circle, about ¼" thick.You can sprinkle a little bit of flour on the rolling pin and work surface, if you wish, so the pastry doesn't stick.
Flip the circles over, so the pressed side with any green onions poking through lie on the bottom of the sheet pan. (This makes them less likely to burn.)
Poke a few holes with a fork on the top of each pastry. This will help them release steam in the oven, so they don't explode.
Brush with oil if desired for a darker golden sheen.
Bake for 15-20 minutes until golden brown. Serve hot or at room temperature.