1 cup flour
1 cup coffee grounds
1/2 cup salt
1 cup water
1/4 cup sand
Mix ingredients together. Shape into a ball and place the thumb in the center to form a hole. Place a treasure inside and cover-up. Let dry for 4 to 5 days. It is supposed to resemble a rock or a pumice stone. Then the child cracks it like an egg. An idea is to shape it like an egg and place a dinosaur inside. Have it crack and let the child be amazed to find a dino inside.
References / Source:
Kathy, Hiawatha Council