Had a eureka! moment yesterday. I grilled shrimp as I do a lot and decided to make stock with the shells. While I waited for the grill to heat up, I sautéed maybe 1/4 cup of diced onion in maybe a tbsp of butter in a sauce pan, then added shells from 1 lb of 16-20 ct. shrimp, a couple cloves of smashed garlic, and a good shake of oregano, dill, parsley and thyme, and a good lug of salt. Added water to cover it all, brought to a boil, covered and let it simmer while I cooked and while we ate.
When it was done (maybe an hour) it was so incredibly richly flavorful. I was amazed. Yielded about two, two and a half cups. I’ll poach some white fish in it tomorrow. Maybe try my hand at veloute sauce.