Eggplant and tomatoes pair in easy make-ahead summer casserole

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Visuals count, especially when appetites wilted by summer heat need a pick-me-up. The look of this eggplant and tomato casserole is just the thing, the glossy purple of the eggplant offset by the red of the sliced tomatoes that have been wedged gently into the eggplant before baking.

Visuals count, especially when appetites wilted by summer heat need a pick-me-up. The look of this eggplant and tomato casserole is just the thing, the glossy purple of the eggplant offset by the red of the sliced tomatoes that have been wedged gently into the eggplant before baking.

I’ve never forgotten how impressed I was the first time I saw this tian d’aubergines in 1999 in Chester, Conn. Monique Hanson, former owner of a home-based cooking school, was making the dish for a lunch party the next day; I was writing a series about local cooks for the Hartford Courant.

The dish can be served hot, cold or room temperature.

“In the summer, it’s always nice to have something cold when it’s hot outside,” Hanson said recently by phone.

Along with its appearance, it also will be hard to forget how good this dish tastes, particularly if you are using just-harvested eggplant, ripe tomatoes and fresh-picked thyme from the farmers market or your garden.

Tian d’aubergines

Use a baking dish that can hold the eggplant snugly. I’d probably do the baking the night before or early in the morning before the heat of the day takes hold. Improvise with aluminum foil if your baking dish lacks a lid. Serves 6.

2 onions, peeled, thinly sliced

1 tablespoon fresh thyme, minced

2 or 3 medium eggplants

4 to 5 tomatoes, sliced

2 tablespoons balsamic vinegar

1 tablespoon Dijon mustard

6 tablespoons olive oil

Salt and pepper to taste

Heat oven to 350 degrees. Lightly oil a gratin dish or casserole; spread the sliced onions on the bottom. Sprinkle the thyme over the onions.

Slice the unpeeled eggplants at roughly 1/4-inch intervals, taking care not to cut all the way through; you want the eggplant slices to remain attached to each other.

Insert a tomato slice into each cut of the eggplants. Make sure the top of each tomato slice is level with the top of the eggplant for presentation. Arrange the layered eggplants layered on top of the sliced onions.

In a small bowl, mix the vinegar and mustard together; while whisking, slowly add oil. Drizzle vinaigrette over the eggplant. Season with salt and pepper.

Cook, uncovered, 1 hour. Cover; cook until the eggplant is cooked through and soft, 1 hour.