Pumpkin and Kale Stuffed Shells

package jumbo shells

can pure pumpkin puree

block firm tofu ((drained and pressed*))

dried sage

chopped kale

can crushed tomatoes

extra virgin olive oil ((optional - for oil-free use 3-4 tbsp water))

large sweet onion ((diced))

garlic cloves ((minced))

dried basil

salt and pepper