Place Italian bread crumbs in a food processor bowl. Cover and process crumbs until very fine. Add the olives, lemon peel, lemon juice, mustard, and garlic; process to a paste like consistency.
To serve, cut baguette-style bread into 1/2-inch slices. Spread each slice with olive mixture. If desired, top each with a tomato wedge and garnish with fresh oregano. Makes 12 one-tablespoon servings.