01 - Preheat oven to 400°F. Line baking sheet with parchment paper.
02 - Combine water, milk, butter, sugar, and salt in medium saucepan. Bring to boil over medium heat.
03 - Remove from heat. Stir in flour all at once. Return to heat and cook, stirring vigorously, until dough forms ball and pulls away from sides, about 2 minutes.
04 - Transfer dough to mixing bowl. Cool 5 minutes. Beat in eggs one at a time, mixing well after each addition, until smooth and glossy.
05 - Spoon dough into piping bag fitted with large round tip. Pipe 4-inch strips onto prepared baking sheet, spacing 2 inches apart.
06 - Bake 20 minutes at 400°F. Reduce temperature to 350°F and bake 15 minutes until golden and crisp. Cool completely on wire rack.
07 - Whisk together lemon juice, zest, sugar, and eggs in heatproof bowl. Set over simmering water as double boiler. Whisk constantly until thickened, about 8 minutes.
08 - Remove from heat. Whisk in butter until smooth. Chill until cold.
09 - Whip heavy cream to stiff peaks. Gently fold into chilled lemon curd until incorporated.
10 - Slice cooled éclairs in half horizontally. Pipe or spoon lemon cream onto bottom halves. Top with fresh raspberries. Cover with top halves.
11 - Whisk together powdered sugar, lemon juice, and zest until smooth and pourable.
12 - Spread or drizzle glaze over éclair tops. Chill at least 30 minutes before serving to set filling.