Weigh and mix the seasonings: salt, pepper, sugar and "quatre épices" spice blend (see below*). Do calculate these quantities carefully and respect the following proportions:7 g salt and 2 g pepper for 600 g liver
The best way to do this is by using precise scales, but you can also measure them: 1 level teaspoon = 5 g of fine salt or 2.5 g of ground pepper (or near enough).
This is the second tricky stage
of the recipe. It is important to use the right quantity of salt for the weight of liver. To help you, here is a little automatic calculator