Preparation:
1. Make dressing: Drain oil from tuna into glass measure; add oil to make 1/3 cup. Reserve tuna for sandwich. Place oil in blender with remaining ingredients; blend.
2. In bowl, mix vegetables, olives, and capers. Remove some soft inside from bread; discard (or freeze for stuffing?). Brush inside loaf with some dressing; add remainder to pepper mixture. Mix in tuna gently, leaving chucks.
3. Grill bread, oiled side down, until toasted. Pile tuna mixture onto toasted sides. Top with watercress; close. |