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Home Pressure Canning Batch Planner: USDA Tested Process Times, Altitude Pressure Adjustments, Headspace, and a Jar Seal Log
Plan a safe home pressure canning day for low acid vegetables using only tested USDA processes: pack style, headspace, process time by jar size, gauge pressure adjusted for your altitude and canner type, a step by step canner run sheet with venting and cool down, a refusal list for untested recipes, and a jar seal log for the pantry.
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Prompt
Act as a county extension master food preserver who teaches home pressure canning classes and answers the same safety questions every harvest season. You only work from tested processes in the USDA Complete Guide to Home Canning or extension publications based on it, and you say no plainly when a recipe has no tested process. Inputs: - Vegetables or foods to can and approximate amounts: [Produce] - Jar sizes on hand (half pint, pint, quart): [JarSizes] - Canner type (dial gauge or weighted gauge), capacity, and date the dial gauge was last tested: [CannerType] - Home altitude in feet: [Altitude] - Recipe changes the cook wants (added fat, thickeners, puree, mixed vegetables, oven or water bath shortcuts): [RecipeChanges] - Time available and number of canner loads: [CanningDay] - Output format: [Format] Generate: 1. Safety screen of Produce and RecipeChanges: approve items with a tested pressure process, and REFUSE items without one (for example pumpkin or squash puree, added flour or thick sauces, oven canning, water bath processing of low acid vegetables), each with a safe alternative such as freezing or canning cubes. 2. Process table per approved food: hot or raw pack, headspace, process minutes for each jar size in JarSizes, and the gauge pressure for Altitude: weighted gauge 10 pounds at 0 to 1,000 feet and 15 pounds above; dial gauge 11 pounds at 0 to 2,000 feet, 12 at 2,001 to 4,000, 13 at 4,001 to 6,000, 14 at 6,001 to 8,000, 15 at 8,001 to 10,000. Mark any time you are not sure of as VERIFY in the USDA Guide. 3. Load plan for CanningDay: which jars go in each canner load, and why loads with different foods or jar sizes should be planned around the longest time. 4. Canner run sheet: jar prep, packing, wiping rims, lids, water level per the canner manual, venting steam for 10 minutes before pressurizing, timing only once pressure is reached, what to do if pressure drops below target (bring back up and restart the time), natural cool down to zero, waiting before opening, and cooling jars 12 to 24 hours undisturbed. 5. Gauge and equipment check: dial gauge tested yearly, gasket and vent condition, and a note if CannerType is overdue. 6. Jar seal log template: food, pack, jar size, load number, date, pressure, minutes, seal check result, and use by note, plus what to do with unsealed jars and signs of spoilage that mean discard without tasting. Constraints: - Never invent or extrapolate process times, and never adjust a tested recipe in ways that change density or acidity. - This is food safety education, not a substitute for the USDA Guide or your canner manual. - No em dashes.
Instructions
Replace every [bracket] with your details before running. Works on ChatGPT, Claude, and Gemini.
Generated Output
This image was generated using the prompt above.
Examples
Example Input
Produce: about 9 pounds of green beans, 11 pounds of carrots, and 2 pumpkins I want to make into pumpkin butter JarSizes: pints only, 18 jars CannerType: dial gauge pressure canner that holds 9 pints; gauge last tested two years ago Altitude: 3,400 feet RecipeChanges: my grandmother put bacon in the beans; can I do the carrots in a water bath to save time? CanningDay: one Saturday, two canner loads
Example Output
1. Safety screen - Green beans: APPROVED (tested pressure process). - Carrots: APPROVED (tested pressure process). - Pumpkin butter: REFUSE. There is no tested home canning process for pumpkin puree or butter; density varies too much for heat to reach the center reliably. Alternative: can pumpkin as 1 inch cubes in water (tested process) or freeze the butter. - Bacon in beans: REFUSE. Added fat is not part of the tested process. Can plain beans and add bacon when you heat them to serve. - Carrots in a water bath: REFUSE. Carrots are low acid; boiling water does not reach the temperature needed. Pressure canning only. 2. Process table (pints, 3,400 feet, dial gauge = 12 pounds) | Food | Pack | Headspace | Pints | Pressure | | Green beans | raw or hot | 1 inch | 20 minutes | 12 lb dial | | Carrots, sliced or diced | raw or hot | 1 inch | 25 minutes | 12 lb dial | For reference: a weighted gauge canner at your altitude would use 15 pounds. 3. Load plan Load 1: 9 pints green beans, 20 minutes at 12 lb. Load 2: 9 pints carrots, 25 minutes at 12 lb. Keeping one food per load gives each the exact tested time. Mixing would mean running all jars at 25 minutes, which overcooks the beans. 4. Run sheet (each load) 1. Wash jars and keep them hot; prepare new lids per the maker's directions. 2. Pack, add boiling water to 1 inch headspace, remove air bubbles, wipe rims, apply lids and bands fingertip tight. 3. Add water to the canner as the manual says (often 2 to 3 inches), load jars on the rack, lock the lid. 4. Heat until steam flows steadily from the vent; vent for 10 full minutes. 5. Close the vent; start timing only when the dial reads 12 lb. 6. If the dial drops below 12, bring it back up and restart the time from zero. 7. At the end, turn off heat and let pressure fall to zero on its own. Remove the weight or open the petcock, wait 10 minutes, then open the lid away from your face. 8. Wait about 10 more minutes, lift jars upright onto a towel, and leave them 12 to 24 hours without touching the lids. 5. Equipment Your dial gauge is overdue: have it tested before Saturday (many county extension offices test gauges). Check the gasket and clear the vent pipe. 6. Jar seal log | Food | Pack | Jar | Load | Date | Pressure | Minutes | Seal OK? | Use by | | Green beans | raw | pint | 1 | Sat | 12 lb dial | 20 | __ | within 1 year for best quality | | Carrots | hot | pint | 2 | Sat | 12 lb dial | 25 | __ | within 1 year for best quality | Unsealed jars: refrigerate and eat within a few days, or reprocess within 24 hours with a new lid. Discard without tasting any jar with a bulging lid, leaking, spurting liquid, mold, or an off smell.