Flavor – Lamb’s Gamey Flavor

Sous vide not only keeps the proteins (main component) at a lower temperature, but also the spices/oils/flavorings. Heat helps release the taste and aroma of all the ingredients, and the sous vide might not be hot enough to do that.

So, while it kind of kills the simplicity, you could always sautee the seasonings in oil before adding them to the sous vide bag (not until cooler though). Or just keep them separate and recombine for serving. Sous vide itself (not the vacuum part) is mainly for maintaining/achieving a controlled internal temperature, and skilled cooks don't only sous vide a dish; they might sous vide and then finish under a broiler for texture, or with a torch. If the sauce isn't working inside the bag, make it work outside the bag.

Alternately, put the ingredients in the bag the day before, and let them marinate overnight in the fridge. The vacuum action is essentially just a speeded up marinade, so this should do the same.

Also, make sure you're using enough (but not too much) SALT.

Finally, call the Sous Vide Supreme company. They know their product's capabilities and limitations and might have some good recommendations.

Just my guesses.

I haven't cooked chocolate with regular wine per se, but my instinct is that to get the right marriage of flavour you really might need to consider alternative approaches with both a higher sugar and alcohol content: dark chocolate is a very powerful flavour that will obliterate most wine.

So I would try using something else wine-related but with a considerable higher sugar and alcohol content: Port and chocolate certainly can complement each other well - I would recommend a tawny port (I have used this combination as a sauce for a savoury dish). You might try sherry too, but this is slightly riskier territory in my opinion.

A further alternative depending on the dish you are cooking would be to pursue your current course add a third component that will help with the overall flavour structure, typically something bittersweet and with fruit, such as redcurrant jelly.