Using an electric mixer on low speed, cream butter, applesauce and sugar until the butter is fluffy, about 2 minutes. Add flour, 1/3 cup of coconut, vanilla and salt and mix until a dough starts to form. You may end up with a very crumbly dough, and that's okay. Just gather the dough together with your hands. Freeze dough for 15 minutes or chill in refrigerator for 30 minutes.

Preheat oven to 350 degrees F (175 degrees C) and line a large baking sheet with parchment paper or silicone mats.

Mix remaining coconut and sesame seeds in a small bowl. Set aside.

Scoop out about 1 1/2 tablespoons of cookie dough using a medium cookie scoop or measuring spoons. Roll each bit of cookie dough into a ball and roll in the coconut-sesame mixture. Place all rolled cookie dough on prepared baking sheet, with about 1 1/2 inches of space in between. Flatten the cookie dough slightly and create a small indentation in the center. I used my pestle for this, but you can also use your thumb. Fill each indentation with 1/2 teaspoon of jam or lemon curd.

Bake cookies for 12 to 14 minutes, or until the bottoms start to brown. Let cookies cool on baking sheet for at least 5 minutes before transferring to wire rack. Cookies will firm up once they cool.

Store in a sealed container in room temperature for up to 2 days.