Heat the oven to 450°F (230°C). Stem the red bell peppers, cut them into quarters, remove the seeds, and place them on a baking sheet.
Roast for 15–20 minutes, or until partially blackened on the outside.
Remove the peppers from the oven and immediately cover them with a lid for 10 minutes to trap the steam. This will loosen the skin, making them easier to peel.
Line a rimmed baking sheet with parchment paper or a silicone baking mat. Arrange the walnuts in a single layer on the prepared baking sheet. Toast until fragrant, stirring occasionally, about 5 to 7 minutes, just until they release their earthy flavor. Let them cool completely.
Heat the oil in a skillet over medium heat. Once the oil starts to shimmer, add the onion and cook until softened. Remove from the heat and set aside.
Place the walnuts in a food processor and pulse until coarsely ground. Add the roasted peppers, breadcrumbs, cooked onion with its oil, cumin powder, coriander powder, tahini, and red pepper flakes. Process until well combined.
With the motor running, gradually add the pomegranate molasses and tahini until the mixture is smooth and fully homogenized. The ingredients have been tested and the balance is just right, but feel free to play around a little—taste and adjust the seasoning, spiciness, and acidity to suit your preference.
Spread the muhammara onto a plate and garnish with pomegranate seeds. If, like me, you enjoy a little extra tartness, drizzle some pomegranate molasses over the top just before serving. Sublime!