The process of canning roasted tomatoes begins by oven-roasting ripe tomatoes at 450°F. Pack the roasted tomatoes into canning jars with citric acid or bottled lemon juice and process in a boiling water canner for 85-100 minutes, per elevation.
How Do You Roast Tomatoes for Canning?
The first thing required for canning roasted tomatoes is to roast fresh tomatoes.
Choose ripe tomatoes with no visible blemishes for roasting, then follow these steps:
- Preheat your oven to 450°F.
- Wash the fresh tomatoes under running water.
- Remove the cores and slice them vertically into halves.
- Place the sliced tomato halves in a single layer with the cut side facing down on a 1/2” high, rimmed baking sheet.
- Optional: Add flavor to the tomatoes by sprinkling with 1-2 teaspoons of oregano, rosemary, basil, or black pepper.
- Roast the tomatoes in the oven for 45 to 50 minutes, or use the broiler setting and broil for 3-5 minutes. Use tongs to move the tomatoes periodically to prevent burning. Roasted tomatoes will have a wrinkled appearance and brown to black spotting.
- Once the tomatoes are roasted, remove the baking sheet from the oven and turn the oven off. Allow the tomatoes to cool on the baking sheet.
- If you wish to remove the skin, pinch the thin, wrinkled skin between your fingers and pull it towards the center to lift it away from the tomato flesh.
- Squeeze the tomato until most of the seeds come out. Collect the tomato pieces, discarding any that are overly charred or burned.
- Place roasted tomatoes into prepared canning jars for canning.
What are the Best Tomatoes for Roasting and Canning?
Large paste varieties are the best for roasting and canning recipes, including:
- Amish Paste
- San Marzano
- Roma tomatoes
While any tomatoes can be canned, the best tomatoes have less water content and thick or meaty walls, which is excellent for making tomato paste or sauces.
Further, they are easier to peel than other varieties, and their sugars are quickly caramelized by roasting for an intensely-flavorful outcome.
Are Oven Canning Roasted Tomatoes Safe?
Per the National Center for Home Food Preservation, using an open kettle, conventional oven, microwave oven, or dishwasher for home canning isn’t safe or recommended because the heat isn’t high enough for safe processing.
What Can You Do With Canned Roasted Tomatoes?
Canned roasted tomatoes can be used the same as fresh roasted tomatoes in many Italian recipes.
Turn roasted tomatoes into tomato sauce, pasta sauce, or puree. They can be added to stews and soups or as a topping for fresh salads.
Can Roasted Cherry Tomatoes Be Canned?
Yes. It’s possible to can roasted cherry tomatoes in a boiling water canner or a pressure canner. They can be canned like other tomato varieties in pint or quart jars.
How to Store Roasted Canned Tomatoes
It’s best to store canned tomatoes in a dry, dark place with a temperature between 50-70 degrees Fahrenheit.
The USDA recommends using home canned goods within 12-18 months. If you have an opened jar of roasted canned tomatoes, refrigerate and use it within 5-7 days.