This is one of my go-to make ahead sandwiches for events. I've done this a few years running for teacher appreciation lunches at school and do for potluck picnics as well.
Halloumi cheese doesn't seem to have hit the big time yet in the US, but is very popular across the Eastern Mediterranean, from Greece into the Middle East. It's the cheese that squeaks when you bite it and, when grilled retains its shape, rather than just melting into an unmanageable pool of goo.
The recipe is infinitely adaptable--I often use a lot of store-bought, prepared ingredients for this: jars of grilled vegetables in olive oil, such as peppers, zucchini and artichoke, and mild, but flavorful, red-pepper spreads, such as Yugoslavian Ajvar as well. However, you can easily grill your own vegies or make your own red pepper spread. —innoabrd
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