The other day, I made waffles for the first time in a long, long time. I had no recipe to use, so I found one online, and used it almost verbatim. When fresh, the waffles were very nice, however, the day after they were cardboard-like and lacking in flavour.  I made a double batch. The original recipe calls for:   2  eggs 1 dl sugar 2 dl skim soured milk 1½ dl low fat milk 1 dl water 350 g plain flour 1 ts baking powder ½ ts baking soda 1 ts vanilla sugar ½ ts cardamom 125 g butter   The original recipe told me to mix all the wet ingredients except the butter, then mix the dry ingredients separately before mixing them together to form a smooth batter. It then called for leavening for 15 minutes, before melting and mixing in the butter and cooking.  As I said, I made two changes. One was that I left it to leaven for three hours, in the fridge. The other is that I kept a little of the melted butter - approximately 20 grams - outside of the batter to grease the waffle iron.  In scaling the recipe, I simply doubled all proportions.  Any ideas? 
I haven't personally tried making lemon essential oil. But according to Young Living, an MD named Jean Valnet estimated that it takes 3,000 lemons to produce one kilo of Lemon essential oil. Here are some links to the estimations (keep in mind that a kilogram is roughly 2.2 lbs):   Young Living (states 3000 makes 1 kilo)   LemonMania (states 3000 makes 1 kilo) Veriditas Botanicals (states 3000 makes 2 lbs (about .91 kilo))  