I don't know how authentic it was or wasn't. I have no context. That is the only harissa I've ever had. I've looked for it in the supermarket, but haven't found any.
Since I enjoyed it so much, I decided to make my own.
Mine doesn't replicate that of Stonewall Kitchen, but it has that similar sweet and spicy quality that made me like it so much. It's a simple set of ingredients that combine to create a complex sauce.
1 24 ounce jar roasted red peppers
3 cloves garlic
1 puya dried chile
2 tbls olive oil
1 tsp cumin seed
1 tsp coriander seed
3 pieces allspice
2 1/2 tsps salt
Add it all to a blender, including the liquid from the roasted red peppers. Puree until smooth.
Chill in the fridge for a few hours to thicken.
It tastes as good as it looks!