Place tomatoes, sugar, apple cider vinegar, balsamic vinegar, soy sauce or Worcestershire sauce, red pepper flakes and thyme in a pot, stir together and bring to a boil. Turn down heat to a steady simmer and cook, stirring occasionally until thickened to a gel-like consistency. (You can place a small spoonful of jam in the freezer to test the texture.)
Remove thyme stems and let cool. Serve with Burrata and sourdough toast.
Note: Jam can be stored in an airtight container in the refrigerator for up to two weeks.