Fiery Tiny Tomato Rasam

Name: Fiery Tiny Tomato Rasam
Ingredients: 20 "Tiny" Tomatoes like Grape or Cherry - cut in half; 1 Tbs - Tamarind Pulp Block (about the size of a ping-pong ball) - look at section below for substitute; 1.5 Tbs - or Store-Bought Rasam Powder; 4-5 - Garlic Cloves - thinly sliced; 3.5 cups - Water; 2 tsp - Kosher Salt - more to taste; 1/4 tsp - Mustard Seeds; 1/2 tsp - Cumin; 2 - Whole Dried Red Chilies; 4-5 - Curry Leaves; 2 Tbs - Vegetable or other neutral oil