Bring 12 cups water to a boil in a large pot.
Stir in rice and return to a boil, cook, uncovered, for 45 minutes.
Strain rice in a fine-mesh sieve, let drain for about 15 seconds, then return to the pan.
Cover and let rice steam, off heat, for 10 minutes.
Meanwhile, heat a large skillet over medium heat.
Melt the butter, and then add the celery, garlic, and onion...cook for about 12 minutes.
Add stock and cherries, simmer until liquid is evaporated, 2-3 minutes.
Stir in reserved rice, the chopped parsley, thyme, salt (1/2 teaspoon), pepper (1/2 teaspoon).
Taste and add more salt, if necessary.
Transfer to a serving platter.
Grate lemon zest over the top.
Garnish with celery leaves and parsley.