• Make-Ahead

Ingredients

1. 2 tablespoons extra-virgin olive oil, plus more for brushing
2. 3 medium eggplants (about 3 3/4 pounds total), halved lengthwise
3. 6 red bell peppers
4. 2 medium onions, finely chopped
5. Salt
6. Cayenne pepper
7. 5 cups rich chicken stock, preferably homemade (see Note)
8. 3 garlic cloves, smashed
9. 1 cup mayonnaise
10. 2 teaspoons fresh lemon juice
11. 2 tablespoons minced mint, plus more for garnish

Directions

1. Preheat the oven to 400°. Lightly brush a large rimmed baking sheet with olive oil. Arrange the eggplants on the baking sheet, cut side down, and bake until just tender, about 20 minutes. Let cool slightly, then cut the eggplant halves lengthwise into thirds. Discard the eggplant skin and the very seedy portions, then cut the eggplants into 1/2-inch chunks.
2. Preheat the broiler. Lightly brush the red peppers with olive oil and set on a heavy baking sheet. Broil the red peppers 6 inches from the heat, turning the peppers occasionally, until lightly charred all over, about 15 minutes. Transfer to a bowl, cover with plastic wrap and let steam for 10 minutes. Peel, core and seed the peppers, then cut them into 1/4-inch dice.
3. In a large saucepan, heat the 2 tablespoons of olive oil until shimmering. Add the onions and cook over moderately low heat, stirring occasionally, until softened, about 7 minutes. Gently stir in the eggplants and peppers and season with salt and cayenne. Add the stock and bring to a boil. Simmer over moderate heat until the flavors blend, about 10 minutes.
4. Meanwhile, in a mortar, pound the garlic with 1/2 teaspoon of salt until smooth. Stir in the mayonnaise, lemon juice and a pinch of cayenne.
5. Stir the 2 tablespoons of mint into the soup and ladle into shallow bowls. Top with a dollop of aioli and a sprinkling of mint and serve.

Make Ahead

The recipe can be prepared through Step 4. Refrigerate the soup and aioli separately overnight. Gently reheat the soup before serving.

Notes

This simple soup derives much of its flavor from chicken stock. If you don't have time to make your own, try one of the rich frozen stocks available at specialty markets.