Preheat oven to 325 degrees To clean mussels, wash and scrub the outside of their shells and pull off any remaining stringy “beard” from the hinged side of the shell; inspect for broken shells and throw those away.
Heat oil over medium in a pot and add onions; cook until soft, about 6 minutes.
Add tomatoes, garlic, and curry powder to pot and stir.
Add coconut milk and water and bring to a soft boil on medium heat.
Add mussels, stir and toss to coat in sauce, and cover for 8 minutes.
6.
When done, all shells should have opened and meat should easily pop out of shell.