Ratatouille

Why This Ratatouille Works

In the oven, the vegetables sit on top of each other and slowly steam in their own juices under the foil. Eggplant and zucchini give off a lot of moisture, so everything around them starts to soften too. The onion and garlic spread through the dish as they cook, so their taste moves into the eggplant, peppers, and tomatoes instead of staying in one spot. With the foil on, nothing dries out, and the vegetables stay moist and tender.

After the foil comes off, the top is no longer trapped in steam. The edges of the tomatoes and peppers start to dry a little and brown in spots. Olive oil on top keeps the vegetables from burning and lets them brown slowly. Over these last minutes, the juices in the dish thicken up a bit instead of being watery. By the time it comes out of the oven, the vegetables are soft enough to cut with a spoon but still hold their shape, and the basil on top stays fresh and bright.

Mistakes To Avoid

Cutting the vegetables much thicker than 1/4 inch makes them cook unevenly. The eggplant may stay a bit tough and spongy while the tomatoes on top collapse into mush, so the dish ends up with hard bites under a watery layer instead of soft, tender layers.

Letting the ratatouille bake uncovered the whole time causes the top to dry out before the bottom softens. The tomatoes and peppers on top can shrivel and brown too fast, while the eggplant underneath stays firm and slightly rubbery.

Packing the slices in a deep pile instead of a fairly even, flat layer traps a lot of liquid in the center. The middle turns soupy and steamy instead of gently soft, so the vegetables stew in their own juice and never get that light caramelized edge.

Skipping the rest time after baking means the juices do not settle back into the layers. The first scoops come out very wet, with liquid flooding the plate and the slices slipping apart instead of holding in neat, soft stacks.