Heat a medium saucepan on high heat.
Add the oil to the hot pan, reduce to medium heat.
Add the onion, garlic, and ginger, stirring often, until soft and translucent, 3 to 5 minutes.
Stir in mustard seeds, coriander, and pepper flakes; cook until the mustard seeds start to pop.
Stir in the frozen raspberries, vinegar, honey, orange juice and zest; season with salt.
Simmer, stirring often, until mixture has reduced and thickened, about 10-15 minutes.
Serve immediately or place in a container, allow to cool and cover and store in the refrigerator.
Chutney can be served chilled or hot.