- Toast bay leaf and peppercorns. In a pot, combine vinegar, olive oil, salt, sugar, red pepper flakes, and oregano and bring to a simmer. Add bay leaf and peppercorns. Remove pot from heat and steep 5 minutes. Then strain through a fine mesh sieve, discarding solids.
- Place vegetables in a 1-gallon container and pour liquid over top. Refrigerate for 2 days before using. Strain and discard liquid. In a food processor, pulse vegetables. Giardiniera will keep in airtight container in refrigerator for a few weeks.