Preparation Cook peas with water and 1/2 teaspoon salt in a 5-quart heavy pot over moderate heat, covered, stirring occasionally, until heated through and tender, about 8 minutes. While peas cook, stir together butter, mint, parsley, pepper, and remaining 3/4 teaspoon salt until combined well. Pulse peas (with cooking water) in 2 batches in a food processor until coarsely puréed, transferring to a large bowl. Stir in herb butter until melted.
Preparation Cook peas with water and 1/2 teaspoon salt in a 5-quart heavy pot over moderate heat, covered, stirring occasionally, until heated through and tender, about 8 minutes. While peas cook, stir together butter, mint, parsley, pepper, and remaining 3/4 teaspoon salt until combined well. Pulse peas (with cooking water) in 2 batches in a food processor until coarsely puréed, transferring to a large bowl. Stir in herb butter until melted.