Grilled Strawberry Caprese Cakewich

slices pound cake ((slices should be about 1/2-inch thick))

slices part-skim mozzarella cheese (, divided)

strawberries (, sliced, divided)

ground fresh peppercorns

basil leaves (, thinly sliced (chiffonade), divided)

chocolate chips (, melted, divided)

-or-

Chocolate Syrup