First prepare your quick puff dough. Flour, soft butter, and salt go in a mixer fitted with a paddle attachment. Cold water and vinegar go together in a separate cup.
Turn mixer on low and slowly pour water into flour mixture. Then add your cold cubed butter and mix for 10 seconds- it is important to finish this dough by hand.
Remove dough from mixer onto a work surface (you should have large chunks of butter and dough should appear dry but it is good! Don’t add any more water).
Form the dough by rolling into a log and kneading. Wrap and rest dough for 1 hour in the fridge.
Next, start your guava jam.Puree and lemon juice go in a small sauce pot on medium heat. Whisk sugar and pectin in a separate bowl. Add sugar/pectin mixture to puree and let it cook down to half volume and thick, about 15-20 minutes. Remove from heat and cool in a separate bowl. Once cooled, put into a piping bag and set aside.
Once dough has rested, roll out onto a floured surface into a long rectangle. You’ll need to roll into 4 book folds. I seriously hate reading a recipe that tries to explain how to laminate dough without pictures, I always just get confused. I found a really good video that fully demonstrates so you don't want to pull your hair out from reading confusing directions.
Remember to chill the dough between folds in order to keep the butter cold.
To make cream cheese filling, add cream cheese and sifted powdered sugar to a mixing bowl fitted with a paddle attachment. Mix to incorporate, then add yolk. Once mixed, put into piping bag and set aside.
Preheat oven to 375 degrees F.
Once dough is ready, roll into a large rectangle about 1/8” thickness. Using a ruler and pizza cutter, cut 3”x3” squares.
Fill each square with a little cream cheese and a little guava jam, in whichever design you’d like!
Place on a sheet tray 2 inches apart from eachother.
Make an egg wash by mixing 1 egg with a splash of water and brush over each danish. Sprinkle with a little sugar.
Chill dough in freezer for 10 minutes, then bake until golden and crispy, about 20-25 minutes. Cool, and enjoy!!