Preheat oven to 400 degrees F; toss tomatoes in a bit of olive oil and sea salt. Place cut side up on a parchment-lined baking sheet and bake for 20 minutes while you prepare the rest of the dish. Then set aside.
Bring a large pot of water to a boil and cook pasta according to package instructions. When done, drain, cover and set aside.
In the meantime, prepare the sauce. In a large skillet over medium-low heat, add 1 Tbsp olive oil and the garlic and shallot. Add a pinch of salt and black pepper and stir frequently, cooking for 3-4 minutes until softened and fragrant.
Stir in 3 tablespoons flour (or as needed to thicken) and mix with a whisk. Once combined, slowly whisk in the almond milk a little at a time so clumps don't form. Add another healthy pinch of salt and black pepper, bring to a simmer and continue cooking for another 4-5 minutes to thicken. Taste and adjust seasonings as needed. (Optional: You can also add a few shakes of vegan parmesan for extra flavor at this time if you wish)
If you want an ultra creamy sauce, transfer sauce to a blender (or use an immersion blender) to blend the sauce until creamy and smooth. Place back in pan and reduce heat to a low simmer until desired thickness is reached.
Once the sauce is to your desired thickness, taste and adjust seasonings as needed. Then add pasta and roasted tomatoes and stir.
Serve immediately and garnish with extra black pepper, fresh basil and/or vegan parmesan cheese.