Pâté de Thon (Tuna Pâté) | Saveur

Ingredients

• 1 tbsp. powdered gelatin
• 2 tbsp. olive oil, plus more
• 1 tsp. minced rosemary
• ½ small yellow onion, roughly chopped
• ½ cups mayonnaise
• ¼ cups parsley leaves
• 2 tbsp. dry sherry
• 2 (6-oz.) cans tuna, packed in oil, drained
• Zest of 1 lemon
• Kosher salt and freshly ground black pepper, to taste
• ¾ cups heavy cream
• Sliced cucumber, lemon, and olives, for garnish (optional)