Warm olive oil in a large saucepan over medium heat. Stir in the flour, blending until a paste forms. Cook, stirring constantly, for one minute.
Incorporate 1/2 cup of the chicken broth, whisking swiftly to create a smooth paste. Gradually add the remaining broth, tomato passata, salt, pepper, and 2 tablespoons of the prepared spice mix. Whisk thoroughly.
Raise the heat slightly and cook for 3 to 5 minutes, stirring frequently until the sauce thickens to a syrupy consistency. Remove from heat.