Step 1

Using kitchen scissors, cut pork fat cap into the desired size.  I did 2-inch strips.

Step 2

Place pork in the air fryer and set the air fryer to 390 degrees.

Step 3

Set time for 20 minutes, checking at the 10-minute mark and stirring pork.

Step 4

Add additional 5-minute intervals until the pork is crunchy on the outside (mine took 27 minutes total)

Step 5

Let cool and remove cracklings from the air fryer.

Step 6

Pour pork fat into a glass jar and allow it to cool before refrigerating.

Step 7

Remove the fat cap from the freezer and let stand 5-10 minutes

Step 8

Cut fat cap into 1-inch sections

Step 9

Place fat cap and water in the slow cooker and set on high for 8 hours

Step 10

After 8 hours, remove any leftover fat with a slotted spoon and drain the lard into a glass jar.  Place remaining pieces of fat in a skillet with salt and onion.  Cook on high for 5-10 minutes or until brown.