Typical remoulade sauce is high in fat and low in carbs and should be tolerated by most individuals.
Remember that fat affects gut motility and might trigger flareups in some individuals.
Rémoulade is a condiment invented in France that is usually aioli- or mayonnaise-based. Although similar to tartar sauce, it is often more yellowish (or reddish in Louisiana), sometimes flavored with curry, and sometimes contains chopped pickles or piccalilli.
It can also contain horseradish, paprika, anchovies, capers and a host of other items. While its original purpose was possibly for serving with meats, it is now more often used as a condiment or dipping sauce, primarily for sole, plaice, and seafood cakes (such as crab or salmon cakes).