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Step 1
Start by setting your oven rack about 6 inches from the broiler and preheat it. Line a baking sheet with foil, then place the peppers cut-side down on the sheet. Pop them under the broiler and let them cook until their skins are blackened and blistered, which should take around 5 to 8 minutes.
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Step 2
Once they’re nicely charred, transfer the peppers to a bowl and cover it tightly with plastic wrap. Let them steam and cool for about 20 minutes—that makes peeling off the skins a lot easier. When cooled, peel off the skins and discard them.
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Step 3
Next, toss the roasted peppers, canola oil, pepitas, red wine vinegar, lime juice, cotija cheese, garlic, salt, and pepper into a blender or food processor. Give it a quick blend to mix everything together. Then, gradually add the cilantro while blending until the dressing is smooth and creamy.
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Step 4
In a large bowl, whisk together the mayonnaise and water until you get a smooth consistency. Finally, stir in the pepper mixture until everything is well combined and creamy. Your dressing is ready to enjoy!