I want to make Naan, but I am on the Keto diet and traditional wheat flour has too many carbohydrates. Can I make it with vital wheat gluten instead of flour? Do I have to add anything else?
"High" gluten flour has, at most 15% gluten. "Indian" white flour, or maida has 7.5%.
If you manage to pull it off, you basically end up with what's essentially a pan fried slab of mock meat, rather than a bread - basically seitan.
You typically add gluten to flour to modify its characteristics - the only way you're going to be able to make naan that approximates a real naan in any way is, well, adding flour.
No, I don't believe vital wheat gluten will work in this way for your recipe. When hydrated, vital wheat gluten is very sticky, and you can't roll or flatten it out very easily like you would need for naan -- and I'm not even sure it would cook and rise the same way as regular flour. There are gluten-free all-purpose flour that are made for baking. I would recommend using that instead of the flour called for in your recipe.
You couldn't use only vital wheat gluten, as that would produce a rubbery mass, that would be too elastic to stretch out to a flat shape (and stay there). Though it can still be tasty, it wouldn't really resemble naan or any other flatbread.
While I don't have an exact naan recipe, I do have a pizza recipe — which uses a large portion of Vital Wheat Gluten as part of its "flour" — that would serve as a very good starting point. It does require some special ingredients that may be harder to get where you're located, though I'm not sure. Even if you can't make it yourself, I hope this will prove that it is certainly possible.
While this pizza recipe is yeast-risen, it could likely be converted to just use baking powder as a leavener to simplify things.
Flour: golden flaxseed meal (aka linseed) 24% 42.0 g oat fiber 24% 42.0 g vital wheat gluten 46% 80.0 g raw wheat germ 6% 9.0 g 1/8 tsp xanthan gum 0.2% 0.4 g ¾ tsp Diamond Crystal Kosher salt 1.2% 2.1 g 1 ½ tsp instant dry yeast 2.7% 4.7 g ¾ tsp honey* 3.0% 5.2 g water 80% 138 g 1 ½ tsp olive oil 3.9% 7 g Total Yield: 331 g Total Flour: 173 g
* while the honey does contains carbs from sugar, it is serving as the sole source of food for the yeast (since none of the other ingredients are fermentable), and most of it will be consumed during fermentation. As such, it isn't counted when calculating the net carbs.
Dry ingredients added to food processor and mixed well. Heat water to around 125º F. Dissolve the honey in the water and with food processor on low speed, add the water slowly until a dough forms. Knead (mix) in the food processor for 1 - 2 minutes until dough is smooth and resists tearing when stretched. Allow to ferment at room temperature till doubled in size. Then comes the hard part of stretching it out. Do so gradually, in stages, allowing it to rest for 15 minutes in between stretching outwards.
To adapt this for a flat bread like naan would be difficult, but should certainly be possible (I'm currently adapting this to a low-carb tortilla recipe which might be a step in that direction).
Calories: 620 Total Fat: 27 g Total Carbs: 71 g Fiber: 56 g Protein: 70 g
Net carbs = 71 - 56 == 15 net carbs.