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1
Char poblano peppers and Serrano chillies over an open flame until blackened on all sides; place in a covered bowl 5 minutes to steam, then peel away charred skin.
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2
Remove seeds and stems from charred peppers and chillies; slice into strips.
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3
Heat oil in a heavy-bottomed skillet over medium heat; sauté onion until translucent, 4 minutes; add garlic and cook 1 minute.
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4
Add pepper strips to the pan, pour in vegetable stock and coconut milk, season with salt and pepper; simmer gently 8 minutes.
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5
Warm tortillas in a dry skillet until pliable, 30 seconds each side.
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6
Fill each tortilla with pepper rajas, top with cheese alternative if using, fold, and serve topped with cilantro and sour cream alternative.