In 5-quart Dutch oven, heat oil over medium-high heat. Stir in onion and salt; cook 3 to 5 minutes or until tender and beginning to brown. Add garlic, gingerroot, jalapeño chile and curry powder. Cook and stir 30 seconds. Add stock, tomatoes, coconut milk, potatoes and cauliflower. Heat to boiling. Reduce heat to slow boil and cook uncovered 15 to 20 minutes, stirring occasionally, until potatoes are tender.