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nawlinsborn73
First, if the person giving the recipe is clear on salt amount, then of course use that. They've made it and know how it tastes. However, if you're changing recipe, adding your own stuff in large amounts then see below.
the salt provides taste as well as Aw reduction and protein extraction. So long as you don't reduce the salt, the last 2 happen. But for taste, once you chew once, your taste buds register saltiness based on the percent overall, NOT JUST THE MEAT. For the saltiness flavor, you should use the total block weight of the sausage. In your case, meat + onions + water.
Recipes are usually written with salt as a % of meat block, but that is for EASE OF CALCULATION, NOT CORRECTNESS. Because most sausage additions to the meat are small, it works out ok. However, if you want a 1.8% saltiness, pretty standard for sausages and what Marianski almost always uses, and you're adding a lot of filler ingredients, use total weight or you'll end up with a bland sausage.
In your example with 300g onions, and lets say you used 10% water, a 1.5% salt sausage would ACTUALLY end up being a 1.0% saltiness, only 2/3 intended flavor.
The ACTUAL SOURCE GUIDE for the correct way to calculate all amounts and percentages of sausage ingredients is the USDA FSIS PROCESSING INSPECTORS CALCULATION HANDBOOK. The guide makes it very clear in their verbiage and all calculation examples, that flavorings (salt), water amount, binders, phosphates, antioxidants, are all to be calculated using the PFW, Product Final Weight, and Batch Weight, which include every ingredient in the sausage, NOT just the meat.
Only nitrite/nitrates, cure accelerators (sodium erythorbate, sodium ascorbate etc), and SAPP (Sodium acid pyrophosphate) when used as a color accelerator, are to be calculated using MEAT BLOCK weight. All other items are calculated using total batch weight and Product Final Weight.
Hope that is helpful :) Download and reference the Handbook for all curing, additions, and calculations questions, it is a quick read and contains all valid answers.
SmokinAl
I'm pretty sure he just meant salt, not cure1.