I Googled the 'Guam moori' and interestingly I was close to the spelling which appeared as Guamoori. It is fennel as I understand, the seeds at the restaurant were generally slightly smaller than the seeds I have in my cupboard. This could be due to cultivation methods or a variant of the Fennel plant but for all intents and purposes, it is Fennel.
I really couldn't say what has been added to the tomato puree, but the look and consistency now I think of it, really was more like tomato ketchup. It was the colour that struck me, you could almost sense the flavour oozing through it.
One thing I forgot to add, I asked specifically about the adding of tomato to the base and the answer was no. This is when I was shown the tomato puree.
The Panch Puran is an interesting find and rather gratifying as the ingredients of which, I have put in my Onion Bhaji recipe. 1 tub fives spices, I wonder how many other tubs contain mixtures.
Certainly from what I have seen, I believe there are several key components that enable the restaurant to broaden their menu. I will leave you with this opening comment by the cousin when asked about the sauce initially:
"We have a big menu with many different dishes. The sauce enables us to cook a wide range of products but it is only one small part as we add individual spices to make the different dishes"