Step 1.  Preheat the oven to 300 degrees F and cover a large 11 X 17-inch baking sheet with a piece of parchment paper.  Lower the oven rack to the lowest setting.

Step 2.  Add all dry ingredients to a large mixing bowl.  Mix together with a whisk to get any clumps in the flaxseed meal out.

Step 3.  Add boiling water and melted butter. Mix together with a spatula until a dough forms.  Test for saltiness and add more salt if desired.

Step 4.  Use spatula to spread out the dough thinly on the parchment-covered baking sheet.  It should cover the baking sheet completely from edge to edge and be about 1/4 inch thick.

Step 5.  Bake on lower rack for 1 hour, checking occasionally to make sure it’s not burning.  Turn the baking sheet around halfway through so that it cooks evenly.  Pay attention as seeds are heat sensitive.

Step 6.  Turn off the oven and let the crackers dry in the oven for another hour.

Step 7.  Break into pieces.