1/4 cup plus 2 tablespoons freshly squeezed lemon juice,
divided (2 lemons)
2 firm, ripe Hass avocados
2 pints cherry or grape tomatoes, halved through the stem
1/2 cup medium-diced red onion
Good olive oil
Kosher salt and freshly ground black pepper
3 ounces baby arugula
Pour 1/4 cup of the lemon juice into a mixing bowl. Cut the avocados in half, remove the pit, peel them (or scoop them out with a spoon), and cut in 1/2-inch dice. Immediately add the avocados to the lemon juice and toss carefully. Add the cherry tomatoes and red onion and toss again.
In a small glass measuring cup, whisk together the remaining 2 tablespoons of lemon juice, 1/4 cup olive oil, 1/2 teaspoon salt, and 1/2 teaspoon pepper.
Pour enough of the vinaigrette over the tomato and avocado mixture to moisten completely. Add the arugula, add more vinaigrette, sprinkle with 1½ teaspoons salt and 1/2 teaspoon pepper, and toss well. Taste for seasonings (you want the salad well seasoned!) and serve at room temperature.