If you've ever tried asparagus raw, you know it can come across as bitter. And then you pair it with the peppery radishes and you have a really distinct, and sort of bitter, flavor. The lemon juice and salt really cut through the bitterness. If you feel that the salad is still too bitter, you can add more lemon juice and salt. If you eat just the asparagus alone, it is slightly bitter. However, if you eat all the ingredients as a single bite, it's not bitter. If the salad sits overnight, the asparagus gets softer and the bitterness is almost completely gone. So, if you're looking for a more mild flavor, you may want to make it ahead of time and store it in the fridge overnight before serving.