01 - Rinse farro under cold running water. Combine farro, 3 cups water, and ½ teaspoon salt in a medium saucepan. Bring to a rolling boil, then reduce heat to low and simmer uncovered for 25 to 30 minutes until grains are tender but still retain a slight chew. Drain excess liquid through a fine-mesh strainer and spread on a sheet pan to cool to room temperature.
02 - While the farro cooks, halve the cherry tomatoes, dice the cucumber into quarter-inch pieces, and slice the red onion into thin half-moons. Set aside in a large mixing bowl.
03 - In a small bowl, whisk together the lemon zest, orange juice, lemon juice, olive oil, honey or maple syrup, Dijon mustard, a pinch of salt, and several grinds of black pepper until the dressing is fully emulsified and slightly thickened.
04 - Add the cooled farro, prepared tomatoes, cucumber, red onion, chopped parsley, mint, and dill to the large mixing bowl. Pour the citrus dressing over the top and toss thoroughly until every component is evenly coated.
05 - Taste the salad and adjust salt and pepper as needed. Let it rest for 10 minutes at room temperature so the grains absorb the dressing and the flavors marry.
06 - Transfer to a serving platter and sprinkle with crumbled feta cheese and toasted sunflower seeds if desired. Serve chilled or at room temperature.