Heirloom Tomato–Avocado Tartare

In a small bowl, combine the mushrooms, shallot, scallions, olive oil, 2 tablespoons of the lemon juice, and salt and pepper to taste.

Put the tomatoes in a large bowl. Halve the avocados. Carefully press the blade of a sharp knife into the pit, twist, and pull gently to remove. Cut 1⁄4-inch slices horizontally and vertically into the flesh of the avocados to make medium-sized squares. Scoop out the flesh with a large spoon and add it to the tomatoes, along with the diced cucumbers.

Add the mushroom mixture and the remaining lemon juice to the tomato mixture. Gently mix with a large spoon, making sure not to mash the avocado. Taste and adjust the seasonings if necessary. Cover and chill in the refrigerator for 30 minutes to 1 hour.

To serve, present the tartare in a bowl. You can also offer individual servings: pack the tartare into a 2-inch ring mold to shape it, then remove the mold. Garnish with the tortilla strips and sprouts and serve at once.