Cook fregola in a large saucepan of boiling salted water until al dente (14-18 minutes), strain and reserve.
Meanwhile, bring wine, stock and saffron to the boil in a large saucepan over high heat, add clams, cover and shake pan occasionally until clams open (3-5 minutes; remove clams individually as they open). Set aside in a bowl.
Strain cooking liquid through a fine sieve and keep warm.
Heat olive oil in a frying pan over medium-high heat, add shallot, garlic and chilli and stir occasionally until tender (4-6 minutes). Add prawns and calamari and stir until just opaque (2-4 minutes), then add fregola, reserved clams, reserved cooking liquid and remaining ingredients and stir to combine. Serve hot.
Note Cleaned littleneck clams, from New Zealand, are available from select fishmongers. If you're using clams that haven't been cleaned, you'll need to soak them to remove grit first. If littleneck clams are unavailable, substitute Australian clams.
This recipe is from the April 2012 issue of Australian Gourmet Traveller.