First, open the squid bodies by slitting down one side and then cut each piece in half.
Toast the cumin seed in a dry pan and then grind it in a mortar with the chili. Mix these ingredients with the salt and sesame seed and then mince the garlic.
Mash the garlic into the cooking oil, pour it over the squid and let marinate for at least an hour.
Thread the squid pieces on to skewers and coat liberally with the spice blend.
Grill the skewers for 7 or 8 minutes on each side until the flesh is cooked through and the edges have a little bit of crispiness. Serve immediately.