l blood:10g fat:10g filler:g spice:g salt

laura
=====
1l blood
300ml milk
450g onions
350g fat
35g filler
5g spice
1:35:0:5:0

WholeMeal
=========
1l blood
850g fat
40g spices
50g filler
17g salt
1:85:5:0:17

Somerset Lads
=============
1l blood
170g fat
300g onions
370g filler
15g salt
9g spice
1:17:37:9:15

AussiSnags
==========
1l blood
500g fat
225g onions
250ml cream
500g filler
5g salt
2g spice
1:50:50:2:5

Food.com
========
1l blood
125g fat
250g filler
1.5g spice
1.2g salt
250ml milk
1:12:25:1:1

Boudin
======
1l blood
1kg fat
500g onion
10g salt
1g spice
1:100:0:1:10

1 onion =~ 150g
1 tsp salt =~ 5g
1 tsp spice =~ 1.5g

==========
ranges:

fat: 100,85,35,17,12,5
filler: 50,50,37,25,0,0
spice: 9,5,2,1,1,0
salt: 17,15,10,5,1,0

Let's go for 
300g onion
500g fat
350g filler
2tsp 3g spice
2 tsp 10g salt