How to Make the Ultimate Umami-Bomb Vegetarian Demi-Glace
8 thin leeks (about 2 pounds), white and tender green, split almost in half lengthwise and rinsed thoroughly
3 small tomatoes, cored and cut into wedges
1/4 cup extra-virgin olive oil
1/4 cup red wine vinegar
Salt and freshly ground pepper
Flat-leaf parsley sprigs or minced chives, for garnish
In a large skillet, cook the leeks in boiling salted water until tender, 10 to 12 minutes. Drain the leeks in a colander, refresh them under cold running water and drain on paper towels.
In a medium bowl, combine the tomatoes with the oil and vinegar and toss to coat. Season with salt and pepper and let stand for 10 minutes. Transfer the leeks to a platter and spoon the tomatoes and vinaigrette over the leeks. Serve garnished with parsley sprigs.