Step 1

In a large frying pan, heat 1 1/2 tablespoons of the oil over moderately low heat. Add the onion, bell pepper, and 1/4 teaspoon of the salt. Cook, stirring occasionally, until the vegetables start to soften, about 10 minutes.

Step 2

Increase the heat to moderately high. Add the chorizo and cook, stirring occasionally, for 2 minutes. Stir in the red-pepper flakes, paprika, chicken, 1/2 teaspoon of the salt, and the black pepper and cook, stirring frequently, until the chicken is almost done, about 3 minutes. Cover the pan and remove from the heat. Steam the chicken for 2 minutes. Transfer the mixture to a large glass or stainless-steel bowl to cool.

Step 3

Meanwhile, in a large pot of boiling, salted water, cook the orzo until done, about 12 minutes. Drain. Rinse with cold water and drain thoroughly.

Step 4

Add the drained orzo to the chicken mixture. Toss with the lemon juice, the remaining 2 tablespoons oil and 1/2 teaspoon salt, the tomato, and the parsley.