I was in Lonavala for the weekend with friends. On the way we dined at Chenab Restaurant in Vashi. Although I had heard greatly about the food, I was a bit disappointed. The dal makahani was bit too salty. I liked the paneer dishes. The masala papad had some masala which really disturbed the taste. I couldn't eat non-veg but I could smell some very nice aroma from the neighbouring table. Should be worth a try.
When in Lonavala you must drink coffee at Pragati (it's a little before Coopers Chocolate Fudge store). They serve some of the best cold coffee.
At Tiger Hills there is just one stall which will serve you hot spicy bajiya which is a great treat around monsoon time. They serve onion, potato and corn baji. Of course the staple wada pav is also available. Rahul who serves you these bajiya is a great talker and will jump across those slippery rocks as if its a monkey on the trees.