Ingredients

• 2 slices pumpernickel bread, torn into bite- sized pieces
• 1 tablespoon olive oil
• 1/2 teaspoon freshly ground black pepper, plus more for garnish
• 1/4 cup greek-style yogurt
• 2 tablespoons lemon juice
• 1 tablespoon cider vinegar
• 2 (4.2-ounce) cans oil-packed smoked mackerel, drained and flaked
• 1 (8-ounce) package cooked beets (such as melissa's), drained and chopped
• 1 apple, cored and diced
• fresh dill, for garnish
• lemon zest and lemon wedges, for serving