Heat oil in large saucepan over medium-high heat

Add the onion, cook for 5 to 6 minutes

Add the garlic cook for 1 minute

Add pumpkin, lentils, ginger, cayenne pepper, cumin and water, bring to boil

Reduce heat, cover the pan and simmer, for 20 to 25 minutes, or until pumpkin is soft and remove from heat

Use an immersion blender or food processor and blend until smooth

Return saucepan to the heat. Season with cayenne, salt, and pepper to taste. Keep stirring constantly, until soup is hot.