Yes, tomato paste can be thickened with roasted flour. Roasting the flour first removes the raw flour taste and improves its thickening ability.
To thicken tomato paste with roasted flour, you'll first need to roast the flour. Spread a thin layer of all-purpose flour on a baking sheet. Bake in a preheated oven at 350°F (175°C) for about 5-10 minutes, or until the flour is lightly golden and smells nutty. Be careful not to burn it. Let the roasted flour cool completely.
Once the flour is cooled, you can incorporate it into the tomato paste. Start by adding a small amount of the roasted flour to the tomato paste, about a teaspoon at a time. Mix thoroughly after each addition to ensure there are no lumps. Continue adding roasted flour until you reach your desired consistency. Remember that the mixture will thicken further as it cooks. If you are adding the tomato paste to a sauce, whisk the roasted flour directly into the sauce before adding the tomato paste to prevent clumping.
For a smoother texture, consider using a whisk to incorporate the roasted flour into the tomato paste or sauce. This helps to break up any clumps and ensures even distribution.