Whisk water, Marmite, and soy sauce together (it will be sticky at first but it will dissolve after a minute). Whisk the rice flour in and set aside for ten minutes.
After 10 minutes, add the plain flour, corn flour, and baking powder. Whisk to combine. Ditch the whisk, grab a spoon, and tip in the drained chickpeas. Mix until the chickpeas are coated (don’t worry if the batter seems a little thin).
Heat at least one inch of oil to medium high heat. Test its temperature by dropping a small spoonful of batter into the oil. If it floats to the surface and sizzles, you’re good to go.
Aim for about 3 tablespoons of chickpeas and batter per fritter (I use a heaped Japanese ramen ladle full), or a scant ¼ cup. You can fry multiple fritters at once, but avoid overcrowding the pan (unless you want soggy fritters), for 2-4 minutes, flipping if necessary to crisp and brown both sides until firm and golden. Remove and drain on kitchen paper.
Serve immediately after drizzling the fritters with some extra marmite and sprinkling on some chopped spring onions.