Ingredients

2 large beefsteak tomatoes
Salt and pepper
3 tablespoons extra-virgin olive oil, 3 turns of the pan
4 ribs celery with leafy green tops, chopped
1 pound baby portobello mushrooms, quartered
2 tablespoons sherry vinegar or balsamic vinegar, eyeball it
2 teaspoons Dijon mustard
Handful flat-leaf parsley, chopped

Instructions

Split the tomatoes in half and scoop out the seeds and flesh. Trim the core
tops with small knife. Season the tomato halves with salt and pepper.

Heat the extra, 3 turns of the pan, in a medium skillet over medium-high heat. Add the celery and mushrooms
and cook 7 to 8 minutes until mushrooms are tender. Season the vegetables with salt and pepper and add vinegar
to the pan. Turn off heat and stir in mustard and parsley to coat. Adjust the seasonings.

Divide the warm salad among the 4 tomato halves and serve.