Melon & Chicken Pasta Salad

To prepare dressing: Mash garlic and salt in a medium bowl with the back of a spoon into a chunky paste. Add buttermilk, mayonnaise, tarragon and vinegar; whisk until combined.

To prepare pasta salad: Cook pasta in a large pot of boiling water according to package directions. Drain, transfer to a large bowl and let cool. Add melon, spinach, chicken, cranberries, prosciutto, pepper and the dressing; toss to coat.