In its ongoing transition to an all-scratch menu, the commissary for Minneapolis Public Schools produces four varieties of homemade salad dressing, including ever-popular ranch. It’s served not only on the salad bars in the school cafeterias, but also packaged as a dip for veggies. Mark Augustine, executive chef of culinary and nutrition services for the district, reworked the standard ranch formula to reduce fat and sodium and eliminate artificial ingredients. This housemade version is a blend of light mayonnaise, creamy yogurt, white vinegar and lemon juice. Dried tarragon and dill weed pump up the flavor.