Preheat your grill on high for at least 10 minutes.
Place eggplant slabs on a baking sheet. Sprinkle ½ teaspoon salt evenly all over the eggplant rounds, then flip and sprinkle the remaining ½ teaspoon salt. Drizzle evenly with ¼ cup of olive oil, drizzling half on one side then flip and repeat with remaining olive oil. Spread all around with your fingers and toss them to coat in any oil remaining on the pan.
Place eggplant on the grill and cook, covered, for 4 minutes, or until you get nice grill marks. Flip and repeat for 3-5 more minutes, reducing the heat down to medium.
Transfer eggplant to your cutting board or baking sheet and immediately cover with an upside down bowl or another baking sheet to make it airtight so it can steam for about 10 minutes (this is a trick to help the eggplant get nice and luscious). Stack the rounds on top of each other in two piles and cut into bite-sized pieces.
In a large bowl, whisk together the remaining ¼ cup olive oil, lemon, tahini, soy sauce, and garlic. Add the farro, herbs, tomatoes, olives, and eggplant and toss to coat. Serve topped with cheese and nuts.