01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt until evenly distributed.
03 - In a large bowl, beat the softened coconut oil and granulated sugar together until light and fluffy. Add the applesauce, pineapple juice, lemon zest, and vanilla extract, mixing until smooth and well incorporated.
04 - Gradually add the dry ingredient mixture to the wet ingredients, mixing gently just until combined. Do not overmix.
05 - Scoop tablespoon-sized portions of dough and roll into balls. Place on the prepared baking sheets, spacing them 2 inches apart. Gently flatten each ball with your palm or the bottom of a glass.
06 - Bake for 10 to 12 minutes, or until the edges are set and the bottoms are lightly golden.
07 - Let the cookies cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely before filling.
08 - Beat the softened vegan butter until smooth. Gradually add the sifted powdered sugar, pineapple juice, lemon juice, lemon zest, and a pinch of salt. Beat until the filling is fluffy and thick.
09 - Once cookies are completely cool, spread or pipe a generous layer of the pineapple lemon cream onto the flat side of half the cookies. Top with the remaining cookies to form sandwich pairs.