Step 1

Heat oven to 350°F.

Step 2

Separate each bun into 2 halves. Place 7 bottom bun halves, cut sides up, in single layer in 9-inch springform pan; press gently to form even layer. Brush with about 1/3 of the butter. Cover with 10 wiener halves, cutting into smaller pieces as necessary to form even layer.

Step 3

Spoon ketchup into small resealable plastic bag, then spoon mustard into separate bag. Cut off small piece off one bottom corner of each bag. Use to drizzle 1/3 each of the ketchup, then mustard over wieners in pan.

Step 4

Place 2 bun bottoms and 4 bun tops, cut sides up, over wieners in pan. Brush with half of the remaining butter. Top with layer of 10 of the remaining wiener halves. Drizzle with half each of the remaining ketchup and mustard

Step 5

Cover with remaining bun halves, cut sides down. Brush with remaining butter.

Step 6

Cut remaining wiener halves crosswise in half. Arrange on top of wiener "cake."

Step 7

Bake 10 min. Cool cake 3 min. before removing rim of pan. Top with relish, and swirls of the remaining ketchup and mustard.