You might be wondering what Sunkist has to do with it. I have two theories.
First, this appears to be a dressing for oranges. A very similar recipe for Town and Country Salad Dressing (omitting only the mustard and using one-third of the sugar) appeared in the Eugene Register-Guard on January 18, 1951. They wrote that it “goes well with the new and smart Palm Springs Salad,” which consisted of shredded cabbage, shredded carrots and “peeled and sliced” (really?) navel oranges.
Second, it could have something to do with the lemon juice. I know Sunkist sells packets of lemon juice for food service vendors. That said, it could also have something to do with this contraption:
From a box sold in Canby, Oregon.
Sunkist Town and Country Salad Dressing
1/2 tsp. salt
1/2 tsp. mustard
1/16 tsp. paprika
2 Tbsp. sugar
1 Tbsp. cider vinegar
1/2 c. lemon juice
1 small can evaporated milk
3 Tbsp. mayonnaise
Chill milk in ice try until crystals form. Mix salt, spices and sugar. Add vinegar and lemon juice. Beat milk stiff, slow speed; slowly add first mixture. Fold in mayonnaise.