Mix the flour, onions, baking soda, coriander, salt and spices together in a bowl
Add 7 tbsp of water to make the mixture bind together. If you need more, add it but don't make it too wet, you shouldn't need more than 9
Heat 2 - 3 inches of oil in a pan until around 180C/350F. It's the right temperature if you can drop a piece of cubed bread in and it toasts in 15 seconds
Mould handfuls of the mixture into balls. Using a slotted spoon, place them into the oil. Don't overcrowd the pan, fry in 2 batches
Fry for 10 seconds then flip over and fry 10 seconds on the other side. They should be golden brown
Remove and let drain on kitchen towel. Keep going until all the bhajis are fried off
Cover with foil to keep warm and serve with mango chutney or a raita. I have a recipe for dairy-free raita posted with my pakoras recipe linked below
https://cookpad.com/us/recipes/334206-vickys-chicken-pakoras-with-a-cool-raita-dip-gluten-dairy-egg-soy-nut-free
