Heat a large heavy skillet (like cast iron) to medium-high.
Toss peppers in olive oil and add to skillet.
Cook in batches depending on the size of your pan. Cook until blistered in a few places, then flip to blister on the other side, about 1-2 minutes per side.
Remove from heat to a bowl. Add lemon juice and sprinkle with salt. Toss and serve.
For Citrus Pesto Dip:
Blend all ingredients except oil in a food processor until well-combined.
Slowly add oil and continue to process until combined.