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I love the avial's rich mix of vegetables, simmering in coconut gravy. My mother used to say "Aadu thinnada elai illai, Avialukku podaadha kaaikari illai" (There's no leaf that a goat won't eat, and there's no vegetable that you don't put in an avial). White pumpkin, red pumpkin, yam, raw banana, beans, drumstick, and snakegourd...you can use whatever you like in an avial. Mumbai's chefs have added carrots, peas and dudhi to the list of avial veggies, and in some homes, I've seen bitter gourd used as well. White pumpkin is essential, and makes up almost 40% of the avial.
You need a minimum of 5 different vegetables to make an avial. Cut the vegetables into 2 inch long strips. Harder vegetables like yam are cut thinner while others are cut slightly thicker. Cook the vegetables with turmeric and salt, making sure each vegetable piece is intact and not mashed into others. Every vegetable must be visible separately. Grind coconut and green chillies, and add to the cooked vegetables, along with sour buttermilk. Stir gently, so that all the vegetables float colourfully in the gravy. Garnish with a spoon of coconut oil and curry leaves. Serve the avial with hot rice and papad. Or, like many south Indian households in Mumbai, serve it with phulkas.
Cliched maybe, but I like to think of the avial as a metaphor for Mumbai. People from everywhere arrive here, and the city seems to welcome them all. Although they're different from each other, very soon they begin to fit into the city, and become part of the city's unique cultural blend. Like the fresh aroma of coconut oil from the avial, the Mumbaikar has his own unique cosmopolitan flavour - a strong work ethic, a tolerance for differences, and a willingness to adjust to multi-cultural life in the city.