I cooked some sausages sous vide at about 158F for a few hours. Usually I cook sausage in my pan until it hits an internal temperature of about 155 and it climbs to 165 and they are incredibly juicy. They are 30% fat and I made them myself, so fat is not an issue here. I subsequently used a torch to brown them.
I cooked them sous vide due to convenience rather than wanting the sous vide experience. I expected them to be very juicy because they would be less cooked than in the pan (158 all the way through, and not just in the centre), but they turned out significantly more dry.
Why were my sous vide sausages drier than my pan sausages?
I have two hypotheses, and am open to others: 1. Cooking sous vide resulted in an overall lower temperature, but cooking the sausages longer forced out more fat. 2. When I browned them with the torch, the outside skin shrivelled a bit and some holes appeared because the torch is so hot. I don't think this cooked the sausages any more, but perhaps rupturing the membrane and slightly constricting the casing may have pushed out some of the fat.
Any other ideas?