oliverdavies.uk/source/_partials/pages/blog/teaser.html.twig

{% if post.summary %}
    {{ post.summary|markdown }}
    {% include 'pages/blog/read-more' %}
{% elseif post.blocks.excerpt is defined %}
    {{ post.blocks.excerpt|markdown }}
    {% include 'pages/blog/read-more' %}
{% else %}
    {{ post.blocks.content|markdown }}
{% endif %}