Spicy Tomato Jam
Cook low and slow and add sugar to taste.
Seems crazy to add sugar to taste, but depending on the tomatoes, they may or may not need too much sugar.
Slice all tomatoes into quarters.
Add to a pot and let them reduce for as long as you'd like, around 45 minutes - 1 hour. You'll start to see the tomato start to release all their juice as well as a lot of water. If the pot is small and tall, the water may not be able to evaportate quickly. You can either use a bigger, wider pan or remove some of the excess water and let the tomatoes keep reducing. If you want to reserve the water, you can add it back in.
Once tomatoes are the desired consistency and feel like one cohsive mix, add lemon zest, sugar, and red pepper.
Mix everything and taste. Adjust accoridingly by adding more acidity (lemon) or more sweetness (sugar) or spice (red pepper).
Take off the heat. It will thicken as it sits, but you can always add cornstarch to help it along if you want. Store in the fridge.