- 1 cup mayonnaise
- 2 tablespoons tomato paste
- 2 tablespoons minced red onion
- 1 tablespoon minced green bell pepper
- 1 tablespoon minced red bell pepper
- 1 tablespoon fresh lemon juice
- 1/4 teaspoon salt
- 3 pounds russet potatoes, peeled and cut into 1/4-inch strips
- 4 cups olive oil for frying, or as needed
- salt to taste
- Stir mayonnaise, tomato paste, red onion, green bell pepper, red bell pepper, lemon juice, and salt together in a bowl. Cover the Andalouse sauce with plastic wrap and refrigerate 8 hours to overnight.
- Heat oil in a deep-fryer or large saucepan to 300 degrees F (150 degrees C).
- Submerge potato strips in a bowl of ice water; rinse potatoes in several changes of cold water until water in the bowl is clear. Drain potatoes and pat dry.
- Working in batches, fry potatoes in the hot oil until just cooked through but still white, about 5 minutes. Transfer fries to a paper-towel lined plate to drain. Bring oil back to temperature between batches. Cool potatoes to room temperature, about 30 minutes.
- Increase oil temperature to 375 degrees F (190 degrees C). Working in batches, fry the potatoes again until deep golden, 5 to 10 minutes more. Transfer fries to a paper-towel lined plate to drain. Season fries with salt and serve with Andalouse sauce.