Seasonal eating is a real thing and also an easy thing to be wrong about. Yes, summer tomatoes are better than winter ones; no, that does not mean you have to give up tomatoes from October to June. The orthodoxy gets in the way of cooking.
The truth: a few ingredients are dramatically better in season -- tomatoes, corn, stone fruit, asparagus, strawberries. Everything else is about even. Citrus is fine year-round. Apples store for months. Onions, carrots, potatoes, and leafy greens cook the same in any month.
Build your menu around the dramatic improvers when they peak and use the steady ingredients the rest of the year. That is seasonal eating without the guilt -- and with more flexibility on a Tuesday night.