caramelize

/K EH1 R AH0 M AH0 L AY0 Z/
verb
  1. 1

    To convert (sugar) into caramel.

  2. 2

    To brown (sugar) by means of heat.

    โ€œSlowly cooking the onions will caramelize them, which brings out the sweetness and gives them a brown color.โ€

  3. 3

    To undergo this kind of conversion or browning.

Source: https://en.wiktionary.org/wiki/caramelize