Serve this creamy spread with crisp breads and crackers or as a pizza or bruschetta topping. For a fancier snack, spread on crostini and garnish with the caper-and-tarragon mix, and serve with olives, cherry tomatoes, smoked salmon, or prosciutto. If you don’t have tarragon on hand, use fresh dill, basil, thyme, or oregano—they will all be delicious—and if the spread is too thick, thin it with a little extra cream.