In a saucepan heat the butter over medium-high heat. It will bubble,
then foam and finally the solids in the butter will brown and smell nutty.
Strain the browned butter into a bowl and allow it to cool. It shouldn’t be solid, but no longer hot.
Sift together the sugar, flour and almond meal.
Beat the egg whites until foamy, but still very soft, so they run off the beater when it is lifted. Whisk in the dry ingredients. Add the brown butter, honey and vanilla. If you want a lemon scented cake, then stir in the zest.
Place the batter into a container, cover and chill for at least 2 hours, but this can be done a day or two ahead.