With a text area, when you use the enter key while entering data into it, the enter key gets inserted to the database as "\r\n" (this is a system character for Carriage return, New Line).
On the page where you display the ingredients, use the nl2br() function, this will convert "\r\n" to a <br /> tag:
<?php echo(nl2br($row_recordsetName["ColumnName"])); ?>