Coconut Soda–Pineapple Upside-Down Cake – Garden & Gun

Ingredients

• 3 tbsp. salted butter
• ½ cup packed dark brown sugar
• 1 (15.25-oz.) box yellow cake mix (preferably Pillsbury Moist Supreme)
• 1 (3.4-oz.) box coconut cream pudding mix (preferably Jell-O Instant)
• 1 cup coconut soda or lemon-lime soda (preferably Coco Rico or 7UP)
• ¾ cup vegetable oil
• 3 eggs
• 1 medium pineapple, peeled, halved, cored, and sliced lengthwise into 2-inch-wide planks