Celery baked with Parmigiano and béchamel is a surprising vegetarian Italian side. This fresh mediterranean dish is a healthy, unique family accompaniment that elevates a humble vegetable.
Preheat oven to 375°F (190°C) and butter a medium baking dish.
Trim celery stalks, cut into 4-inch lengths, and simmer in salted water for 12–15 minutes until just tender but not mushy. Drain well and pat dry.
In a saucepan over medium heat, melt butter until foamy. Stir in flour and cook, whisking constantly, for 1–2 minutes without browning.
Gradually add warm milk, whisking steadily to prevent lumps; continue cooking and whisking until thickened, about 3–5 minutes. Remove from heat, season with salt, pepper, and nutmeg.
Arrange blanched celery tightly in the baking dish. Pour béchamel evenly over the celery, then sprinkle with Parmigiano-Reggiano.
Bake on the center rack for 25–30 minutes, or until the top is golden and bubbling. Cool for 10 minutes before serving for best texture.