Answer:
Sure! Here is a basic example of a data flow diagram for a food ordering system:
Level 0 DFD:
```
+-----------------------+
| Food Ordering System |
+-----------------------+
|
+----------|----------+
| |
+-----|-------+ +--------|------+
| Customer | | Restaurant |
+-------------+ +---------------+
|
+------------|-----------+
| |
+-----|------+ +--------|------+
| Menu | | Order |
+------------+ +----------------+
```
Level 1 DFD (Customer process):
```
+---------------------------+
| Customer |
+---------------------------+
|
+------------|--------+
| |
+-----|------+ +------|-------+
| Browse | | Place |
| Menu | | Order |
+------------+ +-----------------+
```
Level 1 DFD (Restaurant process):
```
+-------------------------+
| Restaurant |
+-------------------------+
|
+--------------|-----------+
| |
+----|-------+ +------|-------+
| Receive | | Process |
| Orders | | Orders |
+------------+ +---------------+
```
I hope this gives you a general idea of how a data flow diagram for a food ordering system can be structured.