Step 1. Make a quick pickled red onion for topping the paneer.
Step 2. Saute ginger, garlic, onion, spices, and tomato until the tomatoes break down and disintegrate.
Step 3. Crumble paneer into bite-sized pieces; homemade paneer is best here for its soft texture, but you can use store-bought too!
Step 4. Add your crumbled paneer to the tomato mixture until softened.
Step 5. Assemble your sandwich!