Sweet and Smoky Heirloom Tomato and Watermelon Salad with Pickled Red Onion and Ricotta Salata

Ingredients per serving
Prepare the Tomatoes and Watermelon
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Heirloom tomatoes, roughly cut 1.8 kg
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Watermelon, cut into 2.5 cm cubes 1.35 kg
Prepare the Pickled Red Onions
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Rice Vinegar 720.0 ml
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Sugar 300.0 g
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Red chili, finely chopped 2.5 g
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Red onion, thin slice 450.0 g
Prepare the Buckwheat
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Buckwheat, cooked 335.0 g
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Olive oil, as needed
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Salt and Pepper, to taste
Prepare the Salad
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Baby arugula 50.0 g
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Mint, chiffonade 23.0 g
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Basil chiffonade 10.0 g
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Radish, thin sliced 227.0 g
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Pine nuts, toasted 135.0 g
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Ricotta salata, shaved 492.0 g
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Sumac, to taste