2 cups water
1 cup whole farro (not pearled or semi-pearled; see Note above for explanation)
1/2 large onion (I usually use a white one, for mildness)
2 cloves garlic
9 ounces grape or cherry tomatoes
1 1/4 teaspoons kosher or coarse sea salt
Up to 1/4 teaspoon red pepper flakes (to taste)
1 tablespoon olive oil, plus extra for drizzling
Few basil leaves, cut into thin ribbons
Grated parmesan cheese, for serving