À l’Algérienne is a French food expression that often means something with orange zest or juice in it. Other times, people just use the phrase to describe a dish that seems vaguely Arabic to them.
More traditionally, it was used to describe a garnish made of chopped tomato sautéed in oil along with sweet potatoes — either pressed into croquettes or butter fried.
It’s difficult to know what was considered particularly Algerian about either tomatoes or sweet potatoes, both being of course New World foods.