Some common themes could be friendship and rivalry. In the context of Tsukasa Eishi and Soma, their different cooking styles can lead to a friendly competition. They might learn from each other's techniques, which is a great theme to explore in a fanfic.
You can start by looking on fanfic platforms like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and you're likely to find some well - written Tsukasa Eishi x Soma fanfics there. Just use the search function and type in the relevant tags.
Often, these fanfics might explore the relationship between rindou and eishi in different scenarios. It could be about their adventures together, or how they support each other in difficult situations.
The main characters are Erina and Soma. Erina is a highly skilled and refined chef with a discerning palate. Soma is a passionate and creative chef who often thinks outside the box. Their different personalities and cooking styles make their relationship in the fanfic very interesting.
Another option is to check out some specialized anime or manga fanfic websites. Some of these sites have a large collection of fan - created works. You may need to do a bit of digging around, but it's possible to find some great rindou x eishi fanfics that way.
One possible plotline could be them working together on a special menu for an important event at the school. They combine their unique cooking styles and skills, which leads to a new and amazing culinary creation.
One common theme is the development of a romantic relationship between the reader and Tsukasa. It often starts with an encounter, like meeting in a cooking competition or at a restaurant where Tsukasa works.
The teachers at the school, like Chef Saiba, could also be main characters. They might have known Soma's father in the past and can provide some background information. Or they could be guiding Soma on how to handle the new situation now that his father has been revealed, perhaps helping him to incorporate his father's influence into his own cooking in a positive way.