Preheat oven to 180°C. Line a 6-cup muffin pan with paper cases.
Mix together the almond meal, flour, sugar and baking soda. Make a well in the centre and add in eggs and elderflower cordial. Whisk until all ingredients are well-combined, then add the oil and stir again until you get a batter.
Divide the batter evenly into the prepared muffin cups.
Bake for 20-25 minutes.
Meanwhile, mix the glaze.
Move the muffins to a wire rack and brush them with the glaze. Let it cool for a couple of minutes then scatter some brown sugar on top. Let the muffins cool completely before serving.