Pre-heat oven to 180°C / 160°C fan assisted / gas mark 4 / 350°F.
Whisk the rice flour and chickpea flour together with the salt and set aside.
Line large baking sheets with baking parchment.
Separate the eggs and place the yolks and the whites into 2 separate large mixing bowls.
Beat egg yolks with half (75g) of the sugar and the vanilla for a couple of minutes until thick and pale.
Beat egg whites in a clean large bowl until they reach soft peaks then start adding the rest of the sugar (75g) 1 tablespoon at a time, still whisking until it forms ultra stiff peaks.
Fold egg yolks into white mixture with a metal spoon, being careful not to deflate much air.
Sift the flour blend over the top and continue folding in until just about combined.
Put in piping bag fitted with a plain nozzle and pipe 10cm lines onto the prepared baking sheets, spaced apart. Sift the icing sugar over the top.
Place the baking trays in the oven with plenty of space in between them and bake for 15 minutes. You can bake in batches but make sure to pipe the ladyfingers immediately before placing them in the oven.
Allow to cool for 5 minutes on the tray. Then slide the baking parchment with the baked lady fingers onto a wire rack. Allow the biscuits to cool completely before removing from the parchment. Use a palette knife to slide gently underneath to lift it up.