Massaman curry paste is a mixture of different spices, lemongrass, peanuts, onions, and garlic - to name a few. Most of the ingredients are pretty common and easy to find, with the exception of lemongrass. If you can't find it, I think you could probably just leave it out and the recipe would still be delicious.
Smoky BBQ Veggie Burgers from 'Minimalist Baker's Everyday Cooking'
Crunchy Chickpea Burgers with Homemade Potato Chips
When I became a vegetarian, I had difficulty giving up two things - chicken fingers and burgers. I still miss chicken fingers, probably because they never really tasted like chicken to me, and I've never found a good vegetarian substitute, but burgers, I'm over. I'm now quite content sitting down to a veggie burger rather than a beef burger