Portobello Mushroom Burger with Spicy Avocado Sauce

Portobello Mushroom Burger with Spicy Avocado Sauce was pinched from <a href="http://www.marthastewart.com/313325/portobello-mushroom-burger-with-spicy-av" target="_blank">www.marthastewart.com.</a>
INGREDIENTS
4 large portobello mushrooms, stems removed
1 tablespoon olive oil
Coarse salt and ground pepper
1 ripe avocado, pitted, peeled, roughly chopped
1 tablespoon spicy brown mustard
1 tablespoon horseradish
1 tablespoon fresh lime juice
1 jalapeno chile, finely chopped (ribs and seeds removed, for less heat), if desired
4 soft rolls, split horizontally
1 beefsteak tomato, cored and thinly sliced
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