Using a coarse grater or food processor, grate the carrots and beetroot. In a large bowl, whisk together lemon juice, olive oil and garlic. Season to taste, then toss the carrot and beetroot through the dressing along with the leaves from the chicory (or a crunchy lettuce). Crumble the feta cheese, roughly tear the mint leaves and toss them through the salad. Add crunch with a handful of toasted almonds or walnuts, if you like.