Preparation
Roast tomatoes over medium heat, turning until cooked in a heavy dry skillet for about 5-minutes.
Transfer tomatoes to a cutting surface and cover with a kitchen towel to steam.
When cooled, peal and chop coarsely.
Meanwhile, in the same skillet, toast chiles over medium heat until fragrant, about 20 to 30-seconds.
Set chiles aside and cut into several pieces.
Heat oil in a heavy medium saucepan over medium heat.
Add onion and mushrooms and cook, stirring often, until tender (approximately 2 to 3-minutes).
Add garlic and oregano and cook for 1-minute more.
Add broth, tomatoes and chiles and bring mixture to a boil.
Reduce heat and cover, simmer for 30-minutes.
Transfer sauce to blend or food processor and puree.
Pass sauce through a fine-meshed sieve and return to the saucepan.
Heat thoroughly, stirring occasionally.
Season with lemon juice, sugar, salt and pepper.
Prepared sauce will refrigerate for 2-days or freeze for up to 6-months.
|