Preheat oven to 350 degrees. Butter two 3/4-cup ramekins. Combine 2 tablespoons sugar, egg yolks, flour, lemon juice, and preserved lemon peel in medium bowl and stir to combine. Whisk in the milk.

In a separate large mixing bowl, whisk the egg whites with a sprinkle of salt until frothy. Gradually add remaining 1 tablespoon sugar and beat until soft peaks form. Fold into the lemon mixture until just combined. Divide between the two ramekins, and place them in a baking dish with just enough water to reach half way up the ramekins. Bake for 30-35 minutes, until just beginning to become golden brown on the top.

Serve at room temp or warm.