Lamb Chops and Snap Pea Salad

Name: Lamb Chops and Snap Pea Salad
Ingredients: 1/2 red onion, finely chopped; 2 tbsp. rice vinegar; Kosher salt and pepper; 1 rack of lamb, trimmed; 2 tbsp. olive oil, divided; 2 tsp. coriander, crushed; 1 tsp. ground sumac; 1/4 c. fresh mint, chopped; 2 tbsp. flat-leaf parsley, chopped; 1 1/2 tbsp. fresh lemon juice; 1 tbsp. olive oil; Pinch of sugar; 1 small fennel bulb, very thinly sliced; 1/4 red onion, very thinly sliced; 6 oz. sugar snap peas, halved lengthwise; 1/4 c. flat-leaf parsley leaves; 1/4 c. small mint leaves; 1/4 c. small basil leaves