INGREDIENTS
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4 large portobello mushrooms, stems removed
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1 tablespoon olive oil
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Coarse salt and ground pepper
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1 ripe avocado, pitted, peeled, roughly chopped
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1 tablespoon spicy brown mustard
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1 tablespoon horseradish
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1 tablespoon fresh lime juice
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1 jalapeno chile, finely chopped (ribs and seeds removed, for less heat), if desired
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4 soft rolls, split horizontally
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1 beefsteak tomato, cored and thinly sliced