Hot Sauce – How Does the “Suicide Sauce” from Hot Licks Rate on the Scoville Scale

Whenever you see a sauce separate, it's because you have an Emulsion, which is two or more immiscible liquids. In cooking, these liquids are typically water and fat.

To stabilize an emulsion, you use an emulsifier. The most common food emulsifier is lecithin, and the most common natural source of lecithin is egg yolk. If you don't want the taste of egg or your food is not going to be cooked (i.e. a vinaigrette), then it you can actually go out and buy pure lecithin (soy lecithin is common to find).

As the wikipedia entry mentions, there are other natural emulsifiers such as honey and mustard, and often when you see recipes calling for mustard when it seems to be a strange ingredient to add (such as cheese sauce), the reason is to help stabilize the emulsion.

Additionally, the most common emulsifier used in packaged or processed foods is sodium stearoyl lactylate. It sounds scarier than it is; you can buy it in the store just like lecithin.

There are a few things that might work. I would probably just add more seeds. The majority of the capsaicin where the heat comes from is in the seeds, while the majority of the flavor is in the flesh. You could just add some seeds from a hot pepper like habanero or cayenne or even more jalapeno seeds.

You could also add some chili pepper that has heat but not a lot of flavor. Some examples include cayenne and chile de arbol. Thai bird and african bird chiles are hot and also don't have a ton of flavor in my opinion.

Another option is to try a chili extract. For example, a habenero extract will have some flavor, but a small amount will add an enormous amount of heat. So you may be able to get away with an amount small enough not to add much flavor, while at the same time kicking up your heat to the desired level.

Personally I like habenero, esp in El Yucateco sauce, which I often add straight to hot sauces.