Chop cauliflower, carrots and green beans. Place them in a steamer basket along with green peas. Add 1 cup water to the inner steel pot of your Instant Pot and then place the steamer basket inside.
Close the lid and press the steam button. Steam (high pressure) for 2 minutes and then do a quick pressure release. Remove the basket carefully from the Instant Pot. You may also steam veggies using your regular steamer over a pot of water.
Also boil the potatoes until soft. You can do this in a pressure cooker or on a stove top. Keep the steamed veggies and boiled potatoes in a plate and set them aside.
Heat 1 tablespoon of oil in a pan on medium heat. Once the oil is hot, add grated ginger, chopped red onion, green onion and finely chopped green chilies to it. Cook for around 4 minutes, stirring frequently.
Then add in the steamed veggies along with the boiled potatoes.
Reduce heat to low and start mashing the veggies using a potato masher. Then remove pan from heat and add the garam masala, cumin powder, amchur, red chili powder and salt. Mix well.
Add in the chopped cilantro and mix. Then add 1/2 cup bread crumbs to the pan. Mix until its well combined. We will now make patties out of this mixture.
Make equal sized patties from the mixture. I was able to make 8 patties out of it and each weighed around 90-100 grams. Set them aside.
Make the Batter & Fry The Patties
Make the batter to fry the patties by mixing together cornstarch, rice flour with water until you get a smooth paste. The paste should be thick and coat the patties.
Heat 3-4 tablespoons oil on medium heat. Once the oil is hot, dip patties (one at a time) into the batter and then roll into a plate of breadcrumbs.
Drop the patties into the hot oil, one at a time. Fry until the patties are golden brown from both sides. You may also deep fry them. Fry all patties in a similar way and place on a tissue paper to drain oil.
Make the Burger Sauce
To make the burger sauce, add to a bowl- mayonnaise, sriracha,vinegar, sugar and salt to taste.
Mix until you get a smooth sauce. Set it aside.
Assemble the Burger
To assemble the burgers, heat the burger buns on a pan on medium heat. You may apply some butter or oil while heating the buns.
Apply generous amount of prepared burger sauce on both parts of the bun, then place a piece of lettuce on one side.
To the other part (on which there’s no lettuce), add the prepared burger patty and top with tomato, onion and cucumber.
Close the burger and serve immediately. Repeat steps to make the remaining burgers. Enjoy masala vegetarian burger as such or with a side of french fries!
To make this burger vegan, use vegan mayonnaise or your favorite vegan burger sauce!
If you do not care about crispy burger patties, you can skip the entire step of making the batter. Simply shape the patties and pan fry in hot oil.