1Melt butter in large saucepan over medium heat. Add onion, garlic and sugar, cook for 1 to 2 minutes or until soft. Add broth, water, salt and pepper, bring to a boil, stirring occasionally.
2Reduce heat to low, cook, stirring occasionally, for 15 minutes. Stir in pumpkin, evaporated milk and cinnamon.
3Cook, stirring occasionally, for 5 minutes. Remove from heat.;
4Transfer mixture to food processor or blender (in batches, if necessary), process until smooth.
5 Return to saucepan.