In a medium or large saucepan, heat up the vegetable oil over medium heat.
If using vegan 'chicken', slice or shred (if necessary) and fry it in the oil according to packaging instructions.
Stir in curry paste and fry for 30 seconds.
Add coconut milk, vegetable bouillon, vegan fish sauce (or soy sauce), lime juice, and brown sugar.
Bring to a simmer and add mushrooms, red pepper, carrot, tofu (if using), and sliced red chili.
Simmer for 2 - 5 minutes, depending on how done you like the carrots.
For serving, garnished with chopped cilantro / coriander leaves and a few slices of red chili.Serve on its own, on jasmine or sticky Thai rice or with noodles.