Step 1

Slice cucumbers into 1/4-1/2 inch slices

Step 2

Slice onion into thin slices

Step 3

Layer cucumbers and onions into 2 quart jars or equivalent

Step 4

In a saucepan, heat remaining ingredients over medium heat, stirring occasionally until salt and sugar are melted

Step 5

Bring brine to a simmer

Step 6

Remove from heat and pour over cucumbers and onions, covering completely, and being sure to divide the mustard and celery seeds between the two jars

Step 7

Screw down lid, and let jars cool

Step 8

Store in refrigerator for up to six months, using as desired