Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

$small: "tall";
$medium: "grande";
$large: "venti";

$prices: (
  small: 8,
  medium: 10,
  large: 12
);

@mixin test($p) {
  font-size: $p;
}

/* I want the below to spit out the values of $small, $medium, and $large... not the variable symbol */
@each $size, $price in $prices {
  .what-#{$size} {
    @include test(unquote('$'+'#{$size}'));
  }
}

SassMeister-output.css

/* I want the below to spit out the values of $small, $medium, and $large... not the variable symbol */
.what-small {
  font-size: $small;
}

.what-medium {
  font-size: $medium;
}

.what-large {
  font-size: $large;
}