Make Ahead: Make and chill recipe up to 2 days ahead.
1. Cook peas according to package directions, adding jalapeño to water. Drain.
2. Sauté ham and next 2 ingredients in 2 Tbsp. hot olive oil over medium-high heat 4 to 5 minutes or until lightly browned. Stir in wine, and cook, stirring occasionally, 1 minute.
3. Process peas, jalapeño, ham mixture, and remaining 6 Tbsp. olive oil in a food processor just until smooth. Stir in walnuts and next 2 ingredients; add salt and pepper to taste. Cover and chill 8 to 24 hours.
4. Stir pâté, and add salt and pepper to taste. Transfer to a shallow bowl, or spoon into small jars. Top with desired amount of Pickled Red Onions and Cukes. Serve with crostini.