A multilayered masterpiece in a cast-iron skillet, this one-pan meal calls for simmering creamy bacon orzo on the stove-top, then nestling lemon-coriander salmon fillets on top and baking in the oven.
Preheat oven to 450 degrees. Combine bacon, onion, and 1/4 cup celery in a large straight-sided skillet over medium-high; cook, stirring, until bacon is beginning to brown, about 5 minutes. Add orzo; cook, stirring, 1 minute. Stir in lemon juice and broth; season with salt and pepper. Bring to a simmer and cook, stirring, until orzo is tender and liquid has nearly evaporated, 8 minutes.
Stir together coriander, zest, 1 teaspoon salt, and 1/4 teaspoon pepper. Season fish with spice mixture and nestle into orzo in skillet; cover and transfer to oven. Bake until fish is just cooked through, 5 to 6 minutes; transfer fish to a plate. Let orzo cool 5 minutes, then stir in radicchio with remaining 1/2 cup celery just until wilted. Return fish to skillet and serve, with lemon wedges.