Slice the brie cheese and let it sit at room temperature to soften slightly.
In a small bowl, mix the butter, chives, parsley, Dijon mustard, and grated garlic until smooth. Season with salt and black pepper.
In a separate bowl, toss the arugula with lemon juice and season lightly with salt and black pepper.
Slice the whole wheat rolls lengthwise. Spread the herb butter evenly on the inside of each roll. Layer with deli ham, brie cheese, and dressed arugula.
In a pitcher or large glass, combine the sparkling water, lemon slices, and chia seeds. Stir well, let sit briefly, then stir again to prevent clumping.
Arrange the carrot sticks with hummus and the sliced pear. Serve with the jambon beurre and lemon sparkling water with chia seeds.