Ingredients

• 2 cups apple cider vinegar
• 1/2 cup (packed) light brown sugar
• 1/4 cup kosher salt
• 4 cups any combination shredded carrots, sliced cucumbers, sliced red onions, and/or sliced mild fresh chiles
• 1/4 cup buttermilk
• 1/4 cup plain whole-milk Greek yogurt
• 1 tablespoon fresh lemon juice
• 6 tablespoons olive oil, divided
• Kosher salt, freshly ground pepper
• 2 ripe avocados, halved
• 6 ounces fresh goat cheese
• 6 cups mixed lettuce leaves, ribs removed if thick
• 8 slices multigrain bread, toasted
• 1/2 English hothouse cucumber, thinly sliced on a diagonal
• 2 cups sprouts
• 2 heatproof 1-qt. glass jars

Instructions

1. Bring vinegar, brown sugar, salt, and 2 cups water to a boil in a large saucepan. Meanwhile, pack vegetables into jars. Pour brine over vegetables. Cover and chill until cool.
2. Make the dressing and assemble: Whisk buttermilk, yogurt, lemon juice, and 3 Tbsp. oil in a large bowl until smooth; season dressing with salt and pepper. Scoop avocados into a small bowl; add 1 Tbsp. oil and lightly mash. Season with salt and pepper. Mash goat cheese with remaining 2 Tbsp. oil in another small bowl until softened and spreadable; season with salt and pepper. Add lettuce to dressing and toss to coat; season with salt and pepper. Spread avocado mixture over 4 slices of bread. Arrange lettuce over and top with cucumber, sprouts, and some drained pickles. Spread remaining 4 slices of bread with goat cheese and close sandwiches.
3. Whisk buttermilk, yogurt, lemon juice, and 3 Tbsp. oil in a large bowl until smooth; season dressing with salt and pepper.
4. Scoop avocados into a small bowl; add 1 Tbsp. oil and lightly mash. Season with salt and pepper. Mash goat cheese with remaining 2 Tbsp. oil in another small bowl until softened and spreadable; season with salt and pepper.
5. Add lettuce to dressing and toss to coat; season with salt and pepper. Spread avocado mixture over 4 slices of bread. Arrange lettuce over and top with cucumber, sprouts, and some drained pickles. Spread remaining 4 slices of bread with goat cheese and close sandwiches.
6. Do Ahead Pickles can be made 2 weeks ahead. Keep chilled.
7. Pickles can be made 2 weeks ahead. Keep chilled.