1/2 cup
                        Greek yogurt (full-fat highly recommended)
                                        
                        
                        1/4 cup
                        mayonnaise
                                        
                        
                        2 teaspoons
                        granulated sugar
                                        
                        
                        1 1/2 teaspoons
                        white vinegar
                                        
                        
                        1
                        medium lemon, zest and juice
                                        
                        
                        1 1/2 pounds
                        English cucumbers (about 2 medium- sized ones, or the equivalent weight in Persian or another seedless variety)
                                        
                        
                        1/2 cup
                        mixed tender herbs (such as parsley, mint, chives, tarragon and/or dill)
                                        
                        
                        2
                        very thinly sliced radishes to toss in at the end with herbs
                                        
                        
                        1
                        minced shallot mixed with a squeeze of lemon juice and pinch of salt
                                        
                        
                        1/4 cup
                        crumbled feta cheese