spicy sweet potatoes pickles
- 250 grams (about 1/2 pound) sweet potatoes, sliced into 1/2 centimeter-thick circles.
- 1 cup white vinegar.
- 1 cup water.
- 1 tablespoon salt.
- 5 chiles de arbol, lightly toasted.
- 1 dry chipotle chile, lightly toasted.
- 1 teaspoon each of cumin and fennel seeds, lightly toasted.