As any traveller will tell you, there's an abundance of dhaba's to satisfy your hunger when travelling in Punjab. The good news for the comfort-concious traveller is that more and more 'upmarket' western style service stations are opening up, complete with fuel, a shop and clean toilets (not just one toilet).
I remember stopping at one such place on the way from delhi to Jullandher at about 9 o'clock in the evening. Overall, it was a good experience, and if you wish to order, here's the menu (you should be able to read it if you click on it):
And just in case you're interested in having a look at the menu at the hotel we stayed at, here it is (I like the description 'golden fry' under snacks).