Combine flour, salt and yeast in a bowl

In a small mixing bowl, whisk the egg with the melted butter/oil and lemon juice

Combine the wets with the dries and stir until dough forms

Place the dough between two sheets of parchment paper and roll out to about 1/8  inch thickness

With a sharp knife or pizza cutter, cut dough into desired cracker size (I use a ruler with a pizza slicer to get them straight and even) and sprinkle the top with more sea salt

Slide the bottom piece of parchment and crackers onto a cookie sheet

Bake at 350 from 12-15 minutes until golden

The outer crackers will brown the fastest, remove those and continue to cook the remaining crackers