Making your own bitters is a labor of love, so use the highest-quality ingredients you can, such as unwaxed organic citrus and top-shelf vodka. Gentian can be found online or at some health-food stores.
Detox Cred: Citrus and fresh herbs add clean, fresh flavor to foods, so you don't need to use much (if any) salt. Cilantro lends more than a little zing here: the vibrant herb contains healing phytonutrients and has antimicrobial properties.
The secret to crispy croutons is tearing the bread -- the nooks and crannies absorb more olive oil than evenly sliced pieces. (Of course, the real challenge is not devouring the whole batch when they're warm and fresh out of the oven.)