1.Combine ingredients for passionfruit butter in a medium heatproof bowl over a medium saucepan of simmering water. Stir until mixture thickly coats back of a wooden spoon. Remove from heat.
2.Stand bowl in sink of cold water, stirring occasionally, about 10 minutes. Pour into hot sterilised jars; seal immediately.
3.For lime butter, combine ingredients except rind and colouring in medium heatproof bowl; cook as per passionfruit butter. Stir in rind and colouring before pouring into sterilised jars; seal immediately.
4.For blood orange butter, combine ingredients except rind in medium heatproof bowl; cook as per passionfruit butter. Stir in rind before pouring into sterilised jars; seal immediately.
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