Discard any mussels with broken or chipped shells, and any that do not close when tapped. Scrub shells with sturdy brush; remove and discard beards.
Heat 2 tbsp (30 mL) oil in large saucepan set over medium heat; cook salametti, shallots and garlic for 2 to 3 minutes or until softened but not browned. Add tomatoes; cook for 5 minutes. Stir in wine and saffron; simmer for about 2 minutes or until slightly reduced.
Increase heat to high. Add mussels; cover with tight-fitting lid. Cook for 3 to 5 minutes or until mussels have opened (discard any that remain closed). Stir in basil and butter. Remove from heat.
Meanwhile, brush remaining oil over cut sides of ciabatta. Broil for 3 to 5 minutes or until golden brown. Tear into pieces and serve with mussels.
Tip: For authentic garlic bread, rub the cut side of a halved garlic clove over bread immediately after removing the bread from the oven.