Slice the onions into 7 millimeter / 1/4 inch slices and separate into rings. Take 1 cup of the chickpea flour and sprinkle over the sliced onions. Mix the remaining ingredients adding enough water to make a fairly thick batter. Dip each onion ring into the batter and place in 5 centimeters / 2 inches of hot oil. Fry each side until golden. Place on a paper bag to drain. The amount of batter needed will depend on the size of the onion. Salt and pepper to taste.