Provisions has a wide variety of tasty sandwiches, all made fresh and quickly. Convenient location near the Hyline ferry makes it easy to grab and go eat outside by the docks on a nice day or take it for a picnic lunch elsewhere. It's a pity they don't accept charge or debit cards (seems to be a Nantucket thing) but they do have an ATM on premises. One of the best values for inexpensive eating on the island.
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