Canned Sardine, Tomato, and Caper Sandwiches | Saveur

Ingredients

• Two 4½-oz. cans oil-packed sardines, drained
• ½ cup cherry tomatoes (mixed colors), halved or quartered
• ¼ cup torn fresh oregano leaves
• 2 Tbsp. coarsely chopped mixed pitted olives
• 1 Tbsp. capers
• 2 Tbsp. extra-virgin olive oil
• 1 Tbsp. red wine vinegar
• Kosher salt
• One 12-by-12-in. piece focaccia, preferably day-old or toasted
• 2 ripe medium heirloom tomatoes (mixed colors), thinly sliced