Open file "/skin1/customer/main/cart_contents.tpl" and find the following below:
PHP Code:
<td>{$products[prod_num].product|truncate:30:"...":true}</td>
Change to:
PHP Code:
<td>{$products[prod_num].product|truncate:30:"...":true}
{include file="modules/Product_Options/display_options.tpl" options=$products[prod_num].product_options}</td>