Start by lining a pan with aluminum foil and roasting the poblano, jalapeño peppers and garlic over medium high heat on a griddle, comal, or cast iron skillet until all sides are charred
Then set aside to cool down
Remove the stems, membranes and all seeds from the peppers and peel as much of the charred skin
Then add the peppers, garlic, onion, 1 ½ tablespoon of sour cream, ¼ cup water, juice of half a lime and ½ teaspoon kosher salt to a blender and blend until smooth. If the sauce is too thick add a little more water.
Adjust salt if needed and serve.
Notes
Jalapeño pepper - to make the sauce spicier keep the the seeds and membrane and only remove the stem.For this sauce I remove all seeds from poblano peppers and keep the seeds from the jalapeño pepper for a spicier sauceOnion - I only use a small handful, about a ¼ cupKosher salt - I use Diamond Crystal Kosher Salt in this recipe. If using another brand or table salt start with ¼ teaspoon of salt and adjust from there
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