1 tbsp. shredded Parmesan cheese
½ tsp. dried oregano
2 tsp. red-wine vinegar
1 tbsp. pine nuts, toasted (see Tip)
1 medium clove garlic, chopped
¼ cup sun-dried tomatoes, soft (not oil-packed) or reconstituted and chopped (see Tip)
7 tbsp. water, divided
¼ tsp. freshly ground pepper
¼ tsp. salt
5 tsp. extra-virgin olive oil, divided
1½ pounds Brussels sprouts, trimmed and halved