In a bowl place all the radish ingredients and mix well. Set aside.
Make the Tart Shell
Pre-heat oven to 350 degrees. Spray the tart tin with coconut oil and place in the freezer.
Place all the dry ingredients in a food processor and pulse a few times to mix well. With the processor running add in the cubes of butter one at a time. Mix until it starts forming a dough. Stop and season with salt and pepper to your taste.
Take the tin out of the freezer and press the dough in the tin until it's fully lined. Place back in the freezer.
Make the filling
Place all the filling ingredients in a bowl and mix well. Season with salt and pepper. Set aside.
Bake the Tart
Take the tart out of the freezer and pour in the filling. Place the radishes on top. Bake for 25-30 minutes until the filling is set and the tart shell is lightly brown.