Prep ahead (small but helpful steps)
Make your tofu feta and quick-pickled onion a few hours ahead or the night before. They taste better after a chill. If you skip the pickles, the onion will still add bite — but the pickles temper sharpness beautifully.
Cut the watermelon & cucumber
Remove the rind, cut the watermelon into 1-inch cubes, and place them in a large bowl. Halve the cucumber lengthwise and slice thinly into half-moons. Add cucumber to the bowl with the watermelon.
Add tofu feta & mint
Crumble 100 g tofu feta over the fruit and sprinkle 4 tbsp chopped mint. Keep half the mint to garnish right before serving if you want ultra-fresh perfume.
Make the balsamic maple reduction
Combine ¼ cup balsamic vinegar and ⅛ cup maple syrup in a small pot. Simmer uncovered over low heat for 10–15 minutes, stirring occasionally, until the mixture reduces by about half and coats the back of a spoon. Remove from heat and cool. Transfer to a jar and refrigerate until ready.
Toss and finish
If the watermelon looks very wet, drain a little or blot with paper towels. Add strips of pickled onion and 2–3 tbsp of the balsamic maple reduction to the bowl, toss gently to coat, and taste. Adjust drizzle to your preference. Garnish with more tofu feta, mint, and a final light drizzle of reduction.
Serve immediately
These bites taste best fresh. Place on a serving platter and watch them vanish.