Sauce – How to make a chocolate fudge/syrup sauce that does not freeze

You don't need a brand for brewed chocolate. You just take cocoa powder (which is ground cocoa beans minus most of their fat) and put it into boiling water. You don't even need to strain. But I prefer to make mine with milk (btw, I sometimes brew coffee in milk too).

Solid candy from coffee is something else. What you call "coffee butter" is, in fact, coffee oil at room temperature. I can't find information about the breakdown of the coffee beans, but I am not sure if they have the starch content of cocoa beans (which helps hold a chocolate bar together). Add to this the potential for a heart attack inducing amount of caffeine per bar of caffeeolate and you see why this isn't commonplace.

I guess that the industry today would find ways around these problems. You can hydrogenize the oil (although I don't think it would attain the smooth texture of tempered chocolate, chocolate butter has some very special crystallization properties which allow a chocolate bar to have a silky but hard texture. It will be just grainy) and you can decaffeinate the whole thing, and then mix it with some starch to thicken it, and as much sugar as there is in milk chocolate to counter the higher bitterness of coffee.

But this will be as distant from real rich-flavoured coffee as 39 cent discounter chocolate bars are from real chocolate. There won't be an equivalent of premium dark chocolate (which is the one that tastes of cocoa beans instead of sugar).

If you love coffee so much that you want to try a coffeeolate bar, you are better off making coffee flavoured chocolate. If you want the least taste mix, start with a white chocolate bar. The easiest way would be to melt it and mix in a very small amount of cream with lots of instant coffee solved into it, but the taste will be bound by the instant coffee quality. The other way would be to brew the coffee powder in cream, very concentrated (more than an espresso) and add it to the melted chocolate. You'll have to work at chocolate candy making temperatures (30°C to 32°C), if you overheat, you'll have to retemper the chocolate.

If you make caramel acidic, it won't harden. So use cream of tartar (neutral taste) or lemon juice (easier availability) to create a non-hardening sticky caramel fluid.

I am not sure if you can add dairy (milk, cream, butter, etc). to acidified caramel, but there is a small chance that it will curdle, so I'd advice you to use clear caramel (browned sugar and water only).

I don't know how much acid you need to keep caramel at a certain viscosity at a given temperature, you'll have to experiment for that. Or maybe somebody else can supply this information. IIRC, a good starting point is a tablespoon of lemon juice per 100g sugar, but this is very imprecise.

The other option would be to make a semifluid sauce (cream, or starch-thickened milk, or diluted syrup) and add caramel to it, but the taste would be much weaker. My preference would be the clear caramel + acid route.