Mix the flour, salt and cream of Tartar in a saucepan.
Add the oil, then the water, and continue to mix until thoroughly combined.
Cook over low heat, stirring, until mixture is stiff and pulls away from the sides of the pan, about 3-5 minutes.
Set aside until cool enough to handle, then knead gently on a work surface until smooth.
To Add Color
Make a well with your thumbs in the middle of a ball of dough, and put the food coloring drops into the well. Pinch the well closed with surrounding dough, keeping the food coloring in the middle of the ball. Then, carefully begin kneading it until the color is evenly distributed throughout the dough.
Store in an airtight container.
While coloring your dough, you might want to use gloves on your hands and parchment on your countertops to keep them from being stained by food coloring.
You will likely need to use more natural coloring than you would with chemical food dyes to get dark, rich colors.