INGREDIENTS
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1 19 ounce can cannellini beans, rinsed and drained
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2 teaspoons finely chopped fresh rosemary
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1 teaspoon finely chopped garlic
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5 tablespoons extra-virgin olive oil, plus additional for grill pan
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1 small red bell pepper
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1 7 ounce medium zucchini, halved horizontally
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1 half-inch-thick slice round red onion
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4 4 - 5 inches portobello mushrooms, stems discarded