2 cups whole wheat flour
1/2 cup white flour
1/2 cup cornmeal
1 "regular" can of tuna (drained... you can save the liquid for use as part of the water content)
1/4 cup vegetable oil
1 cup water
another 1/2 cup white flour (for later)
First preheat oven to 350 degrees F.
a) In a large bowl, mix the wheat flour, white flour (or use all white flour), and cornmeal with a fork.
b) In a smaller bowl, mix the drained tuna, the oil, and the water (1 cup of water, or the liquid from tuna and enough water to make a full cup).
c) Mix together a) and b) to make a dough. Add additional flour to the dough to make it knead-able and not too sticky. I used almost an additional 1/2 white flour while kneading.
d) Sprinkle some flour on the counter, roll out the dough to approx. 1/4 in. thick (and sprinkle more flour on the dough if it's still too sticky to the touch), and use a cookie cutter to cut out biscuits. I used a tiny little one that's about 1 3/4 in. long.
e) Line the biscuits on a cookie sheet (I lined mine with tin foil) and bake in the preheated oven for about 25-30 minutes until the biscuits appear dry and their colors have turned darker. Cool the biscuits completely before giving them to the dogs.
The biscuits will not be completely hard when first pulled out of the oven, but they should turn hard and crunchy after they are cooled. You can also leave the biscuits in the oven and allow them to completely dry with the 'leftover' heat if you prefer. You can keep the biscuits longer if they are really dry.
Nuki makes really loud crunching noise when he's enjoying the biscuits!