In a kettle or small saucepan, bring water to boil.
Measure the amount of boiling water required by the recipe and place it in a large bowl with salt. Whisk quickly to combine - not all the salt will dissolve, and that's ok. Set aside while you prepare the remaining ingredients.
In another large mixing bowl, combine the flour and cream of tartar.
Make a well in the center of the flour and pour the oil and hot water/salt mixture.
Stir with a spatula. The dough will be very sticky at first, and then it becomes difficult to stir, so use your hand to knead the dough. If it's still too hot, wait a few minutes to avoid burning yourself.
If the dough is too sticky, dust 1 extra tablespoon of flour and vigorously knead on a for 1 minute. As the dough cools down and absorbs the extra flour, it becomes super soft and less sticky.
When you manage to form a ball, transfer to a lightly floured work surface and keep kneading to cool it down, dusting extra flour if needed until it reaches your favorite texture.
Repeat the recipe to create different colors. Add sprinkles or essential oil if desired.