Makes 4 sandwiches.
basil olive pesto
1 large garlic clove
In a heatproof bowl pour enough boiling water over tomatoes to cover and let stand 20 to 30 minutes, or until soft. Drain tomatoes and pat dry.
Cut loaf diagonally into 4 pieces and halve each piece horizontally. Spread pesto on cut sides of bread and make 4 sandwiches with chicken, tomatoes, and arugula.
Make Basil Olive Pesto:
To a food processor with motor running add garlic and blend until minced. Add basil, parsley, and nuts and blend well. Add oil and blend until smooth. Transfer pesto to a bowl and stir in olives. Pesto may be made 5 days ahead and chilled, surface covered tightly with plastic wrap.
Bring pesto to room temperature before using. Makes about 3/4 cup.