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Rhubarb
Trim off leaves. Wash stalks and cut into ½- to 1-inch pieces.
Hot Pack: Add rhubarb and ½ cup sugar per quart of rhubarb to a large pot.
Let stand until juice appears. Heat rhubarb slowly to boiling.
Pack hot rhubarb in hot jars, leaving ½-inch headspace. Remove
air bubbles. Prepare jar rims. Adjust two-piece lids.
Pressure canning:
Process at 34 kPa (5 psi), 500 ml and 1 litre jars for
8 minutes. When processing at an altitude of 305 metres or above, process at
69 kPa (10 psi) for the same amount of time.
Boiling water canning:
Process 500 ml and 1 litre jars for 15 minutes. When
processing at an altitude of 305 metres or above, see the chart on page 23.
CANNING TOMATOES AND TOMATO PRODUCTS
Tomatoes and tomato products may be safely processed using the boiling
water method or the pressure canning method. Step-by-step instructions for the
boiling water method begin on page 47. For some tomato products, the pressure
canning method may result in a more nutritious canned product.
Acidifying Tomatoes and Tomato Products
Tomatoes have a pH close to 4.6, which means it is necessary to take
precautions to can them safely. First, carefully choose the tomatoes for canning.
Use only tomatoes that are disease-free, preferably vine-ripened, and firm.
Second, an acid must be added to tomatoes whether they are processed using
the boiling water method or pressure canning method. To ensure the safety of
whole, crushed, or juiced tomatoes, add 1 tablespoon bottled lemon juice (not
natural juice) or ¼ teaspoon citric acid per 500 ml jar; for 1 litre jars, add
2 tablespoons bottled lemon juice or ½ teaspoon citric acid.
Salt
Tomatoes and tomato products may be canned with or without salt. Salt is
used only for flavour, as it is not used in a large enough quantity to prevent
spoilage. If salt is desired, use only canning or pickling salt. Table salt contains
anti-caking agents that may cause cloudiness in the liquid inside the jars. The
recommended amount of salt is ½ teaspoon for each 500 ml jar and 1 teaspoon
for each 1 litre jar.
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