First: what is a mezzuah? It's like an envelope to represent our Lord Jesus Christ dying on the cross (perfect for after-Easter). People would nail the mezzauh to the door, and in the hole, slide messages in. Make one for yourself. It's tons of fun!
Step 1: Measure 1/2 cup boiling water, 1 cup all-purpose flour, and 1/2 cup salt into bowl. Stir with spoon until dough is slightly sticky, then knead for 5 minutes straight.
Step 2: Form into a ball (see picture #1), then cut the ball in half. Using only 1/2 of the dough: Roll, using a rolling pin, into a rectangle. (see picture #2). Save the other 1/2 of the dough for step 4.
Step 3: Gently roll the rectangle of dough around a butter knife. (See picture #3)
Step 4: Very gently slide off the rectangle, being so careful not to disturb the hole you made, and place it in a baking tray. (see picture #4). Using the 1/2 of the dough ball you saved in step 2, make decorations by rolling small balls, and making long pieces of dough to be "stripes". Decorate your mezzuah case by rolling these decorations onto it. Bake in the oven at 200 (F) for 2 hours. Note: you may need more then 2 hours. OR let airdry for a couple days.
Step 5: Copy out a Bible verse and slip it into the hole in your mezzuah case (you'll need to roll it up.) How fun!