Fill a large saucepan two-thirds with water; bring to a boil. Cut a shallow “X” on the bottom of each tomato. Using tongs, place tomatoes, a few at a time, in boiling water for 30-60 seconds or just until skin at the “X” begins to loosen. Remove tomatoes and immediately drop into ice water. Pull off skins with tip of a knife; discard skins.
In a Dutch oven, combine remaining ingredients. Add tomatoes and bring to a boil. Reduce heat; simmer, uncovered, 1-2 hours or until mixture reaches desired consistency.
Cool slightly. Process in batches in a blender until smooth. If desired, return all to pan and heat through. Transfer to an airtight container; refrigerate up to 3 days.
Store cooled sauce in airtight containers in freezer up to 4 months.
Wear disposable gloves when cutting hot peppers; the oils can burn skin. Avoid touching your face.