Misskits - I found this on the internet for you - it is an eggless cake - which may have been why you saw it in a health food shop.
BANANA LEMON CAKE
2 cups white, self-raising flour
1/2 teaspoon bicarb
1 pinch salt
3/4 cup sugar
3/4 cup butter
1/2 cup milk
2 medium bananas
1/2 teaspoon lemon juice
3 drops lemon essence
Note: Preheat the oven to 180C/350F/gas mark 4
Use three 15cm/6 inch sandwich tins.
Cream together the butter and the sugar until light
and fluffy. Beat thoroughly, stir in the lemon essence and mashed bananas until blended. Sift flour, soda and salt together. Mix milk with lemon juice to sour the milk, then stir both into the creamed mixture until combined. Banana.
Grease and line the sandwich tins. Divide the mixture evenly between the three tins. Bake for 25-30 minutes or until light brown. Turn on to wire racks to cool.