01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - Arrange the eggplant cubes and diced red bell pepper on the prepared baking sheet. Drizzle with 2 tablespoons of olive oil, season with salt and pepper, and toss to coat evenly. Roast for 25 to 30 minutes, stirring halfway through, until the vegetables are golden and tender.
03 - While the vegetables roast, rinse the millet under cold running water. Bring 2 cups of water and 1/2 teaspoon of salt to a boil in a medium saucepan. Add the rinsed millet, reduce the heat to low, cover, and simmer for 15 minutes until the water is fully absorbed. Remove from heat and let stand, covered, for 5 minutes. Fluff with a fork.
04 - In a large mixing bowl, whisk together the remaining 1/4 cup of olive oil, lemon juice, red wine vinegar, minced garlic, Dijon mustard, and a pinch each of salt and pepper until well emulsified.
05 - Add the warm, fluffed millet to the dressing along with the roasted eggplant, roasted bell pepper, sliced red onion, and halved cherry tomatoes. Toss gently to coat everything evenly.
06 - Fold in the chopped parsley and mint. Taste and adjust the seasoning with additional salt and pepper as needed.
07 - Serve warm or at room temperature, garnished with toasted pine nuts if desired.