Remove leaves and core from cauliflower and break into florets. Place florets in a food processor and pulse about 10 times, until pieces have broken down and resemble rice or couscous.
1 head cauliflower
Add parsley and mint and pulse again until uniformly mixed with the cauliflower.
1 bunch fresh flat-leaf parsley, 2 tablespoons chopped fresh mint
In a large bowl, whisk together lemon juice, olive oil, red wine vinegar, garlic, and salt.
1/4 cup lemon juice, 2 tablespoons olive oil, 1 tablespoon red wine vinegar, 1 clove garlic, 1 teaspoon fine sea salt
Transfer cauliflower mixture to the bowl, and add tomatoes, cucumber, and onion. Stir well to mix with the dressing.
2 tomatoes, 1/2 cucumber, 1/4 cup diced red onion
Serve immediately or chill in the refrigerator until ready to serve.