Pre-heat oven to 375 degrees
Place rasberries, lemon juice and sugar into a small saucepa and bring to a boil then turn the heat to med-low and cook for 10 minutes stirring every couple of minutes until it forms a jam like texture. If there are still chunks of fruit, use a fork to mash tem up. Set aside and allow to cool.
In a large bowl, whisk flour, baking powder, cornstarch, cream of tartar and salt
In a stand mixer, cream butter, and sugar until light and fluffy
Beat in the egg, vanilla extract until thoroughly combined
Gradually add flour mixture until well blended
Cover with plastic wrap and place in fridge for one-hour
Remove the dough from the refrigetor for about 15 mins or until the dough softens enough to scoop it out.
Using a medium-sized cookie scoop, drop the cookie dough onto a well-greased baking pan or parchment paper.
Bake for 10-12 minutes. You want to remove them from the oven when they feel undercooked. You don't want them to get brown or crisp around the edges.
Place on a wire rack until thoroughly cooled
Once completely cooled, spread 1 tbs of rasberry jam on the flat side of one cookie. Press another cookie into it to form a sandwich
Place the chocolate chips and coconut oil in a small bowl and microwave at 30 second intervals until smooth. You can also melt over the stovetop.
Dip half of the sandwich cookie into the chocolate, shaking off excess chocolate, and place on parchment paper or a silicone mat
Allow to dry for 15-30 minutes.