In a large bowl, work together all the ingredients except the dye.
Divide the dough into two parts from 2/3 and 1/3 respectively. Color the smaller part with the food coloring, kneading until obtaining a homogeneous color.
Roll out the dough to a thickness of half a cm and with a very small mold made of hearts.
Add the white dough and make 8 cm squares on each side.
Fold 3 corners towards the center to form the envelope. Then decorate with the hearts, brushing one side with water to attach them.
Let it rest in the fridge for 15-20 minutes.
Let the love letter cookies cool before serving them.
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