Rinse the kumquats and lemon thoroughly. Slice the kumquats thinly. Divide the grapefruit into boats and cut the boats into small pieces. Mash the bananas Zest and juice the lemon. Combine the kumquats, grapefruit, lemon juice and lemon zest in a saucepan and simmer covered for 10 minutes. Add the banana and jam sugar and boil for a further 2-3 minutes. Carefully skim off any foam. Pour into warm, sterilised jars. Seal. Store in a cool, dark place.
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