1 stalk lemongrass
1 cup chicken stock
2 jalapeno chilies, seeded and coarsely chopped
1 Fresno chile, chopped
1 large shallot, chopped
4 cloves garlic, peeled
1-inch piece ginger, grated or minced
1 tablespoon dark brown sugar
A handful fresh cilantro leaves
A handful fresh mint leaves
1 teaspoon ground cumin, 1/3 palmful
1 teaspoon ground coriander, 1/3 palmful
2 tablespoons tamari or 1 tablespoon fish sauce
Freshly ground black pepper
2 limes, juiced
Kosher salt (if not using fish sauce)
2 tablespoons high-temperature cooking oil
1 1/2 pounds thinly sliced chicken
1 sweet red bell pepper, thinly sliced
1 sweet yellow onion, thinly sliced
1 large head iceberg lettuce, well chilled, cored, quartered, and very thinly shredded