Preheat oven to 400.
Bring towards room temperature
1 puff pastry
Core and slice
3 6-7 oz apples (peeled if you want to be fancy ... I don't)
into 14" thick pieces; toss with
1-2T sugar
juice of 1/3 lemon
and microwave for 3 minutes; pour off excess liquid
Place
puff pastry
(once it's warm enough to unfold) onto a jelly-roll pan; prick bottom multiple times with a fork.
beat
1 egg
1 T water
together.
With a pizza-cutter, score the edge of the puff pastry, about 1/2 -- 3/4" from the edge; use a pastry brush to brush this edge region with the egg mix. (Make the rest of the egg into a mini-omelet).
Arrange apply slices in 3 rows down the puff pastry, reserving pretty pieces for the exposed ends.
Back 30 min in middle rack of the oven, until edges of pastry rise and get slightly browned. Use pizza cutter to divide into individual serving.
Top with
a little confectioner's sugar
a little cinnamon
if desired.