1Bring 1 cup of the water to boil in small saucepan on high heat. Remove from heat; add chilies. Cover. Let stand 15 minutes. Drain soaking liquid. Remove and discard seeds. Place chiles in blender container. Set aside.
2Meanwhile, place tomatoes, onion garlic on foil-lined sheet pan. Broil on HIGH 10 minutes, stirring halfway through cooking and removing the garlic clove.
3Add tomatoes, onion, garlic, salt and remaining 1 cup water to blender container. Cover, Blend on high until smooth. Cool completely before serving. Serve with fresh tortilla chips, or as a topping for tacos, nachos or eggs. Store in the refrigerator in an airtight container.