Chile Bathed Fish Grilled in Cornhusks

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1 (8 ounces) package cornhusks

4 ancho chiles, lightly toasted, stemmed, and seeded 

1 tablespoon cumin seeds 

2 teaspoons dried oregano, crumbled 

2 teaspoons dried thyme, crumbled 

1 tablespoon salt 

4 cloves garlic 

1/2 cup mild white vinegar 

1/2 cup warm water

1 1/2 pounds boneless skinless fish fillets, such as catfish or cod 

Salt

For serving:

Olive oil, for drizzling

1 small onion, finely chopped

1/2 bunch cilantro, leaves only, finely chopped

2 large limes quartered

Corn tortillas

1 avocado, peeled and mashed

1 cucumber, peeled, seeded, and diced

2 serrano chiles, stemmed, seeded and thinly sliced