I agree and complent the authour of this recipe. This turned out to be one of my best yet. I ran off a batch last night which consisted of 2 firsts for me.
First run with new grinder
First run using collagen casings
I used the original recipe as posted by Oddley (no nitrates) using 2lb of pork shoulder and 1lb of quite lean belly pork which the NT grinder wizzed through in seconds.
As the temperature in my kitchen is in mid 70's F, I put mix in the freezer for 15-30 mins between each operation
I had a bit of an interesting time with the seasoning though, as I use fresh herbs so it was really a case of chopping and keeping ratios between the herbs consistent with the recipe by volume, then adding fresh herbs to the ground spices at about twice the amount by weight and re-grinding all together.
I like to keep the salt content separate from the seasoning as its function is for binding as well as flavour.
I've found that 1.5% salt (or 1 tbs) per 2lb/1kg + 1tsp of seasoning mix works for me. In this case, for the 3lb meat plus 20% water/rusk, I used 2tsp of the seasoning mix (run through in a blender with the 10% water helps distribute the fresh herb flavour more evenly than being concentrated in flecks.)
I'd bought 28mm collagen casing a while back when passing by the Allied Kenco store. I wanted a size in between the 21mm sheep (very thin and fragile), and 35mm hog casings (good on grill, but too thick for frying) readily available in smaller quantities.
Now I have seen conflicting ideas about using collagen casings, one says to soak for 3 hours prior to use, while the manufacturers say to use unsoaked. I'd tested soaking a short piece and it seemed not to be very manageable whereas the unsoaked casing slides very nicely on to the medium stuffing horn, so being a lazy git I chose the latter.
I was impressed by how smooth and even the sausage poured out of my stuffer with minimal restraint to ensure a proper fill. The only drawback was that the dry casing doesnt compress on the horn so was only able to load about 3ft at a time.
I left the unlinked sausage lengths coiled in the bottom of the fridge overnight. snipped off and cooked a few for a very succulent breakfast this morning.
Flavour had developed nicely, texture perfect, the only snag (no pun intended) was a tendency to burst. I guess the collagen casings do need a "prick with fork"