Step 1

Sift together the flour, sugar and salt into a large bowl.

Step 2

Form a well in the centre and add the egg yolk.

Step 3

Stir to combine then add the milk and butter.

Step 4

Beat with a wire whisk until the batter is smooth and lump-free.

Step 5

Add the egg white to a clean and dry bowl, then beat until stiff.

Step 6

Gently fold into the batter along with the lime zest.

Step 7

Peel the bananas and cut into slices.

Step 8

Heat the oil in a pan. When hot dip the banana slices in the batter and immediately drop into the hot oil.

Step 9

Fry until nicely browned and heated through.

Step 10

Remove with a slotted spoon and drain on kitchen paper as you cook the next batch.

Step 11

Serve hot, dusted with icing sugar.