Season the tentacles with piment d'Espelette, salt, and olive oil. Let them cook on the BBQ in a dish.
Remove the tentacles from the BBQ and cut them into small pieces. Also cut the chorizo into fine pieces. Combine the tentacles with the juices and chorizo with the rice along with the parsley, spring onion, red jalapeño, and olive oil. Season with pepper and salt.
Pat the squid dry with paper towels and coat it with the dry rub.
Stuff the squid with the rice mixture, which can be done with a piping bag with a wide opening or with a spoon. Once the squid is stuffed, place it on the grill in the BBQ. Grill the squid for 10 minutes at 220°C on the BBQ.
Remove the stuffed squid from the BBQ and finish it off with parsley, lemon zest, and lemon wedges, drizzled with some extra olive oil.