The key to any good sub sandwich.
From a box sold in Canby, Oregon.
12 green peppers
12 red peppers
2 Tbsp. salt
1 qt. vinegar
2 c. sugar
Chop peppers and onions. Cover with boiling water; let stand 10 minutes. Drain.
Cover with hot water and let come to boil. Add salt, sugar, vinegar; boil 15 minutes. Pack in jars to seal.
Yesterdish reminder: Modern canning methods only, of course.