Lemon Essential Oil is not edible. Lemon Oil is edible and is sold in cooking stores and specialty grocery stores.1/8 tsp lemon oil = 1 tsp lemon extract = 1 tsp lemon zestHappy cooking!
Since lemon extract is much stronger, I would use 1/2 again as much of the lemon juice. However, if your recipe calls for water or milk in the mixture, cut that back by a tablespoon or two because...