get-posts – how to get custom fields data

I’m using this on my home page to display a featured post

<?php $posts = get_posts( array( 'category' => 23 ) ); ?>
	    <?php foreach ($posts as $post): ?>
	        <li>
	            <a href="<?php echo get_page_link( $post->ID ); ?>" >
			<h1>Featured Post</h1>
			<?php echo get_the_post_thumbnail($post->ID); ?>
			<ul>
				<li><?php echo $post->post_title; ?></li>
				<li><?php echo $post->post_excerpt; ?></li>
			</ul>
		    </a>
	        </li>
	    <?php endforeach; ?>

It works as required but I need to also display in the list the key and value from 2 custom fields for that post and can’t figure it out. Searched the codex and forums but getting confused as per the correct syntax. Any help greatly appreciated.