The food science of Naan. (I'm not a food scientist so this could be way off the mark)
In my usual format I have analysed a standardised set of 10 Naan bread recipes and clearly, it is not a consistent recipe. I even found a book recipe for Tandoor Roti that has identical ingredients, in very similar ratios, to naan. Obviously there would be similarity because it is a bread but there is essentially no difference at all. That's a different question though. The Naan recipes were all adjusted to 1 kg of Plain Flour. H4ppy Chris (Misty Ricardo) are the only one that I could find using Self Raising Flour so they were counted as having 1 kg of Plain Flour and 30 g of additional Baking Powder. This doesn't really affect the end result.
Why? I've recently had the issue with non sticking of my naan to my Tawa and this led me to look at the different ingredient combinations and boy, don't they vary. From reading all 50 odd pages of this thread, I do know that others have had a naan drop off the Tawa when it is inverted, so it isn't just me. The use of water isn't the problem because I used varying amounts with the same result. Naans that fall off the Tawa. I'm thinking that it was the inclusion of oil and maybe it is but I did find 1 recipe for Tawa Naan that does contain oil.

I calculated the percentage of each dough for % of Hydration, Rising Agent, oil / ghee, sugar and salt. I divided the recipes into 2 groups of 5, Yeast and non-yeast (Baking Powder). 3 of the yeasted recipes also used Baking Powder as well.
The recipes used were:
Yeasted: VahRehVah, Khana Khazana, Old Indian Book, Breadmaker ,The Curry Guy
Not yeasted: H4ppy Chris, Misty Ricardo (counted as 1 recipe), No Yeast Generic, Celtnet, Tawa Naan, Tawa Naan 2.
My first question is Oil / Ghee in the dough. All Yeasted recipes except The Curry Guy used oil or ghee in the dough as did both of the non-yeasted "Tawa Naan" recipes. Percentages ranged from 1.2% up to a massive 12%. Surprising to me was Tawa Naan 2 which contained 10%, or 100g of oil. Does it stick to the Tawa or not? I don't know yet.
Hydration: (Oil was counted as a wetting ingredient as well as egg and yogurt where included). Hydration ranged from 57% Misty Ricardo's slightly modified H4ppy Chris 58% up to 88 and 89 % of two of the yeasted naan. From my bread baking days, these figures tend to be at the lower and upper extremes of bread dough hydration, 55% and 90% respectively
The Rising Agent % varied from 0.75 % up to 5 %. The 5 % recipe was the generic no yeast. 50 g of Baking Powder in 1 kg of flour??? but when modified from Self Raising Flour to Plain with extra BP, H4ppy Chris was 3.8% or 38g. The Curry Guy had 4.5 % with 1.5% yeast and 3.0 % of Baking Powder.
Sugar ranged from only 0.6% (VahRehVah) up to H4ppy Chris' massive 10%. 100 g of sugar per kg of flour. Misty Ricardo cut this back to 60 and included salt. So that brings us to:-
Salt, which varied from 0% up to 2%, however there was often the instruction of "Salt to Taste".
A couple of interesting facts to do with Baking Powder are apparently that:
1) It will activate quickly with acid. Hence the absence of yogurt in the long wait / rest recipes like H4ppy Chris. I saw this question asked somewhere in this thread. The inclusion of yogurt with Baking Powder would most likely mean the naan must be cooked fairly soon after the dough is made otherwise it will have lost the chemical reaction fizz.
2) Double acting BP reacts to both acid and heat. This is why it still rises after 24 hours if acid (yogurt) is not used.
Hydration. The long rest periods for H4ppy Chris is to allow the low percentage of moisture ingredients to fully hydrate the flour. The higher hydration dough, at 89%, will be a very wet dough resembling sourdough . These would be very difficult to handle. The use of wet ingredients varied from all water to all milk, some water & some milk, yogurt or not, egg or not, oil or not. Outside yogurt and BP (as above) this is pretty much a choice and some recipes state that these can be substituted and the ratios varied to taste or preference.
So that about sums it up. Another worthless load of trivia from me and a few more hours spent on possibly useless information. Now I need to see if I can use any of this to come up with a naan that doesn't fall off my %$#*++" Tawa. ;D
Edit for extra comment; Naan or Tandoori Roti? Uses only Maida so it's a naan. No yeast so it's a Roti. Not stuffed with a filling so it could be a Roti, but if you do use a filling it's a naan. Both can be cooked by tandoor or tawa. The answer that works for me is that it's BIR naan.