Portobello Mushroom Gratin
Ingredients
- 4 tablespoons butter
- 2 leeks, diced
- 1 celery root, chopped
- 3 large portobello mushroom caps, diced
- 1 tablespoon chopped fresh tarragon, divided
- 1 tablespoon chopped fresh chives, divided
- 1 cup panko bread crumbs
- 1 cup grated Gruyere cheese
- 1.5 tablespoons all-purpose flour
- 0.75 cup heavy cream
- 2 tablespoons water, or as needed
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