Place under the broiler until blistered on all sides. (time will vary depending on the heat of your broiler). When it’s fully blistered, remove and place in a bowl and cover (not touching) with plastic wrap or a towel. Set aside for 15 minutes or so, until it’s cool enough to handle. Using your fingers, slide off the skin and remove the stem and seeds.
Make the dressing
Blend roasted poblano and all ingredients in a high powered blender (best results from a vitamix or similar). Taste and adjust seasonings to your liking.