Paneer Bhurji Sandwich

Name: Paneer Bhurji Sandwich
Prep time: 20 min
Cook time: 13 min
Total time: 33 min
Cuisine: Indian
Ingredients: 6 ounces homemade or store-bought paneer; 1 large red onion; 1 lime (juiced); Salt; 2 tablespoons canola oil (or other neutral oil); 1/2 teaspoon cumin seeds; 1 1/2 teaspoons finely grated ginger (or ginger paste); 1 1/2 teaspoons finely grated garlic (or garlic paste); 1 serrano chili (sliced in half lengthwise; optional, for heat); 1 plum or roma tomato (finely diced); 1 teaspoon garam masala (plus more if needed); 1/2 teaspoon Kashmiri chili powder (or other mild chili powder); 1/4 teaspoon ground turmeric; 2 hamburger buns (toasted); Green chutney, tamarind chutney, or cilantro aioli (for serving)