Final answer:
The question about baja tacos is in relation to a culinary topic and cannot be accurately answered without further context as toppings and bases can vary. Baja tacos typically come on a bed of lettuce, cabbage or rice, and are topped with items like salsa, crema or cilantro.
Step-by-step explanation:
The question you have asked appears to be related to a culinary context rather than an academic subject. Since the details required to fill in the blanks for "The baja tacos come on a bed of ______ and are topped with _______" are not provided, it's not possible to give a definite answer. In general, baja tacos can be served on a bed of various items such as lettuce, cabbage, or rice, and are often topped with condiments such as salsa, crema, or fresh cilantro. However, this can vary widely depending on the recipe or restaurant's menu. Please provide more context or specifics if you're looking for a particular answer.