Cover ingredients with 2 Quarts *cold* water in a large stock pot or saucepan.
Bring to boiling over high heat, then lower heat and *gently* simmer for 4 - 8 hours, replenishing liquid as required to keep about 1 quart of liquid in the pan.
The pot may be left wholly or partially uncovered.
Strain, cool and refrigerate until ready to use.
Ingredients
1 md Onion, peeled & quartered
1 lg Clove garlic, peeled and Quartered
1 Rib celery
2 lb Rinsed shrimp detritus (heads, shells, etc)
(of course, include similar "waste parts" from any Other seafood, if desired.)