for the choux pastry:

1. Preheat your oven to 400°F [205°C].
2. Place the water, butter, sugar, and salt in a small saucepan, and bring to a low boil over medium-high heat. Once the butter has melted and you see a few big bubbles, remove from heat and immediately dump in the flour. Stir together until it forms a firm ball. Move the ball to a stand mixer fitted with the paddle attachment. Turn the mixer to medium-low for about 15 seconds just to break it up and help it cool down. Once it stops steaming momentarily, turn the mixer back to medium-low and add the first egg while it’s running. Once the first egg has incorporated into the dough completely (about 30 to 45 seconds), continue adding one egg at a time, waiting to let each one incorporate between additions. Once the eggs have been incorporated, the pastry should drop from the tip of the lifted paddle in a distinct v shape. Transfer it to 1 large or 2 small piping bags.
3. Line two sheet pans with parchment paper. Cut the tip of the piping bag to leave an approximately ½ to ¾-inch diameter opening. Place a small dot of pastry under the 4 corners of each parchment sheet to help it stick to the sheet pan. Pipe 4 to 5-inch-long straight lines, leaving a generous amount of space between them (they will approximately double or triple in size).
4. Move to the oven and bake for about 15 minutes, then lower the temperature to 350°F [180°C] and bake for about 20 more minutes. Let them cool at room temperature for at least 15 minutes before cutting open or piping.

for the pastry cream:

1. Combine the milk, sugar, and orange blossom water in a large saucepan or small stockpot. Set over medium heat and let it come up to a simmer.
2. While it comes up to a simmer, separately mix the eggs, yolk, cornstarch, and banana together in a medium mixing bowl until there are no raw cornstarch lumps.
3. Once the milk is just simmering, remove from heat and slowly dribble it into the egg/banana mixture while whisking constantly. Return the egg/banana/milk mixture to the saucepan and bring to a simmer over medium heat, stirring constantly. It will thicken as it comes to a simmer.
4. Once bubbles break the surface, continue to cook for about 1 more minute, then remove from heat to cool.
5. Once it’s not piping hot, move to a pastry bag (ideally fitted with a large round tip, but if not, just fill the bag and snip it when you’re ready to use it. If you’re not using a pastry tip, it’s usually best to slice/pipe/sandwich instead of fill, otherwise it can be tricky to get the plastic tip to insert into the end of each eclair). Pipe it while it’s warm or at room temperature.

for the ganache:

• When you’re ready to dip, bring the cream to a bare simmer over medium heat in a small saucepan. Once the cream is barely simmering, remove from heat and add the chocolate, orange blossom water, and a pinch of salt. Swirl to make sure the chocolate is completely submerged. Let it sit for about 1 minute, and then whisk it together until it’s thickened and completely homogenous. Do not reheat, and dip within about 5 to 15 minutes of making.

to assemble:

• Once the shells cool, slice the eclairs open along their length or poke a hole on one end. Pipe or spread pastry cream into the middle (then sandwich them back together if you sliced them open). If you’re met with resistance halfway through piping, feel free to pipe from the other side as well. Make the ganache at the last moment. Dip the eclair tops in the ganache. Decorate immediately with banana chips and orange zest, if using (go easy on the orange zest, otherwise the delicate orange blossom flavor will get lost in the shuffle).