Melt butter in a medium pan over medium heat. Add onion and salt and cook until onion is golden brown, about 10 minutes. Add in the sprig of thyme and cook for another 2 minutes.
Slice croissants in half and place on a parchment-lined baking sheet, cut side up. Spread apricot preserves on the top half and place 3 pieces of brie cheese. On the bottom croissant half, place caramelized onions and folded slices of Castle Wood Reserve® Uncured Honey Ham. Repeat with the other croissant.
Bake open-face for 10 minutes.
Remove from the oven and add arugula. Close the sandwiches and serve with a skewered strawberry for a garnish.
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