Preheat a pan with some olive oil. Add the yellow onion and fry for 1-2 minutes, until it starts to get golden brown.
Add the minced garlic and fry for another minute.
Add the chili and stir to combine, fry for 30-60 seconds again.
Next add the cumin, stir to combine.
Dice the tomatoes and add to the pot along with a little bit of water, lemon juice and fiber syrup/honey/agave. Season with sea salt according to taste.
Lower the heat and let it simmer until the tomatoes are completely soft and you have a smooth salsa like sauce (15-20 min). Stir regularly to make sure it doesn't burn. If needed mix the salsa using a hand mixer. Pour into a bowl/jar and set aside.
Meanwhile the salsa is cooking add the ingredients for the jalapeño sauce to a high speed blender and mix until smooth. Taste to check if more seasoning is needed. Pour into a bowl.
Combine shrimps with rest of the ingredients for the shrimps. Stir to combine.
Turn on the grill or preheat a grill pan over medium/high heat with some olive oil.
Peel and slice the pineapple into smaller pieces.
Grill/fry the pineapple for 5-7 minutes, until it starts to get golden brown and a little soft, but not too soft or overcooked.
When about 2-3 minutes remain for the pineapple to get ready add the shrimps and fry for 1-2 minutes on each side, until golden brown and the meat is no longer translucent.
Set shrimps and pineapple aside.
Grill/fry the tortillas for about 30 seconds on each side. (You can also warm them in the oven).
Assembly the tacos by adding fresh spinach at the bottom of the tortillas. Next add grilled pineapple and shrimps.
Top with tomato salsa, jalapeño sauce, scallion and cilantro.