Preheat a skillet or frying pan or medium heat with a dash of olive oil. Add the chorizo, onions, peppers, and garlic. Cook, while stirring, until softened.
Squid Marinade
In a bowl combine the mirin vinegar, sake vinegar, olive oil, garlic, and dill. Stir to combine. Season to taste with salt and pepper.
Stuffed Squid
Clean the squid and trim if necessary. Add the squid to the prepared marinade and leave for 10 minutes.
Prepare a grill for indirect heat at 275 to 300 degrees F (130 to 140 degrees C).
Remove the squid from the marinade and shake off any excess liquids.
Stuff the squid with the prepared chorizo stuffing. Reattach the tentacles with toothpicks.
Gently place the squid on the preheated grill. Cook the squid until it reaches an internal temperature of 155 to 160 degrees F (68 to 71 degrees C), about 45 minutes.