In a large pot, combine rhubarb, onions, raisins, orange juice and zest, vinegar, salt, spices, and ginger.
Bring to a boil, then simmer over medium heat for about 30 minutes until the rhubarb breaks down.
Reduce heat and continue to cook for 1.5–2 hours until the mixture thickens to a jam-like consistency → Stir occasionally to prevent sticking.
Remove from heat and let cool to about 60 °C (warm to the touch).
Stir in the honey gradually, tasting as you go.
Fill the hot chutney into sterilised jars and seal immediately.
Store in the fridge or freeze in portions.