"On My Own" singer in "Les Misérables" / MON 6-19-23 / Shelfmate of Aleve and Advil / Iconic hairstyle for Amy Winehouse / South American predator whose name translates to tooth fish / Reshape as a pipe cleaner / Prickly plant in a thicket / Whiff three times in the batter's box / Hurling curling or baton twirling / Penguin lookalike

• SLICE OF BREAD (16A: Sandwich top)
• RASPBERRY JAM (31A: Fruity sandwich ingredient)
• PEANUT BUTTER (45A: Savory sandwich ingredient)
• SLICE OF BREAD (57A: Sandwich bottom)

Éponine Thénardier (/ˌɛpəˈniːn təˌnɑːrdiˈeɪ/; French: [epɔnin tenaʁdje]), also referred to as the "Jondrette girl", is a fictional character in the 1862 novel Les Misérables by Victor Hugo.

The character is introduced as a spoiled and pampered child, but appears later in the novel as a ragged and impoverished teenager who speaks in the argot of the Parisian streets, while retaining vestiges of her former charm and innocence. She still loves her brother Gavroche. [...] Éponine is also featured in the stage musical adaptation. She is played by two actors, a young girl for Young Éponine in the Montfermeil scenes, and by a young woman for the adolescent Éponine in the later Parisian scenes. Actresses playing Young Éponine and Young Cosette sometimes interchange roles in different performances to equalize performance opportunities and vocal strain.

The musical gives a pointedly sympathetic depiction of Éponine, which has made her one of the show's most popular characters. Throughout the musical, the ragged, independent, and tragic Éponine is starkly contrasted with the demure, innocent, and sheltered Cosette.

Michelle Kwan skated to "On My Own" during the 1997 Skate America competition as well as the 1998 Tokyo Golden Gala. [...] The character of Joey Potter in Dawson's Creek, played by Katie Holmes, sang this song at a talent show phase of a beauty show, (Season 1, Episode 12) in which she participated. In the pilot episode of Glee, the character of Rachel Berry, played by Lea Michele, sang this song as her audition piece for the New Directions glee club, this version charted at number 42 in Ireland and 73 in the UK. (wikipedia)

EAT A SANDWICH! This puzzle is mostly charming, in that its shape is whimsical and its willingness to just straight-up dupe a theme answer is daring. Hell yeah, second SLICE OF BREAD! That second slice was also a godsend from a Downs-only solving perspective. I could see the sandwich coming by the time I hit PEANUT BUTTER, and then I thought "are they really gonna dupe the bread" and then bam, dupe city. Nice to have that last themer just handed to you like that. My main problem with this puzzle is RASPBERRY JAM, for two reasons. Can you guess what they are? You really, really should be able to guess. OK, the first one is not really an objection, so much as a question, namely ... RASPBERRY? Like ... why? Why that flavor. Lots of other jams out there that seem equally if not much more likely to be found in a sandwich with PEANUT BUTTER, which brings me to my second, stronger objection: the "J" in PBJ stands for "jelly"! You are building an iconic sandwich here, you can't just go swapping out jelly for jam. Now, I don't really want to get into the difference between jam and jelly, because frankly, I don't know and I don't really care, but I know that the sandwich has a name and that name is sacred and that name doesn't contain "jam." I'm sure RASPBERRY JAM is delicious with PEANUT BUTTER in a sandwich, but it's not the paradigm. I would also like to note that MUSHED (or SLICED) BANANA is also 12 letters long and would've worked here. I don't know why I would like to note that, except that I find PBB sandwiches tasty, too.