Preheat oven to 400F. Line a medium sheet pan with parchment paper and arrange tomato red pepper cut-side down and garlic on sheet pan.
Roast tomatoes, pepper, and garlic at 400F 30-35 minutes until softened and slightly blistered in spots. Allow to cool slightly, then remove skin from tomatoes, pepper, and garlic and discard.
Place ancho chiles in a medium bowl and carefully pour boiling water over top. Place something heavy on top of peppers to fully submerge them in water for 15 minutes to allow them to soften.
Remove peppers from water and transfer to a cutting board. Remove stem and seeds and finely chop pepper.
Place ancho chiles, roasted tomatoes, red pepper, garlic, bread pieces, almonds, vinegar, and olive oil in a food processor or blender. Process sauce until smooth, scraping down sides as necessary. Season romesco with salt and pepper to taste and store in refrigerator until ready to serve.