Mix the oil, sugar, lemon zest, lemon juice and oat drink thoroughly in a bowl. Add the flour, salt, baking powder, bicarbonate of soda and poppy seeds to the mixture and mix well. Spoon the batter into the prepared muffin tin.
Approx. 15 mins. in the centre of an oven preheated to 180°C. Take the muffins out of the oven, allow to cool slightly, remove from the tin and leave to cool on a rack.
Mix the icing sugar and lemon juice until smooth. Spoon the glaze over the muffins, decorate with the lemon zest and poppy seeds.