Shrimp Salad "Niçoise"

Ingredients

• 16 or more medium shrimp (peeled and de-veined, tails left on)
• Romaine (Butter lettuce would have been my preference)
• 1/3 cup flat-leaf parsley (chopped)
• 1 1/2 cups green beans
• 1/2 lb baby potatoes (I used a mix of colors)
• 1/2 red pepper (julienned)
• 1/2-1 avocado sliced
• 1/2 cup Niçoise olives (I used Kalamata)
• 1 Tablespoon olive oil
• 1 Tablespoon butter
• Crumbled feta (optional)
• 1/4 cup olive oil
• 1 garlic clove (crushed)
• 1 Tablespoon Dijon mustard (I used stone ground)
• 2 Tablespoons white wine vinegar
• Juice of 1/2 a lemon (reserve the other half of lemon)
• 1 dash cayenne
• Sea salt and pepper to taste