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1
Cream margarine and brown sugar together with a wooden spoon or an electric mixer.
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2
Add salt and vanilla extract, then the 3 egg yolks (keep your whites for later!).
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3
Mix until smooth in texture.
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4
Add the flour slowly, mixing with your hands if needed.
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5
If the dough dosen't form itself after a throughout mixing, add a little bit of water and keep mixing.
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6
One you have your ball of dough, cut 1/3 of it out and put it aside.
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7
Cut the rest into 6 equal parts (or the number of different food coloring you're going to use).
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8
Punch a small hole into each dough balls (but the one you reserved at first) and pour a bit of food coloring into each of them.
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9
Roll the dough into your hands until the coloring is even.
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10
Put each different colors aside.
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11
Roll each colored parts into equal almost perfect rectangles.
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12
Cover each rectangle with the egg white you kept earlier.
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13
Put them all on top of the others and press them lightly.
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14
Cut the sides with a very sharp knife to obtain a nice rainbow layered rectangle.
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15
Cut that rectangle vertically into 4 equal pieces.
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16
Lay two pieces on their side and glue them together horizontally with the egg whites.
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17
Take the reserved white dough and roll it flat.
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18
Cut it into four long rectangles and cover the sides of your rainbow dough layered rectangle with it.
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19
Cover your dough roll with egg whites and roll it into your sprinkles.
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20
Use a sharp knife and cut through your sprinkle covered cookie rectangle vertically into 1/2 inch thick pieces.
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21
You should obtain a clean, layered rainbow pattern.
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22
Lay the cookies flat onto a cookie pan covered with parchemin paper.
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23
Take the rest of your rainbow dough and roll it flat.
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24
Take cookie cutters and make more cookies, decorate them, laugh and have fun!
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25
Bake at 350 farahneit for 8-9 minutes and let cool completely.
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26
Enjoy!
